diff --git a/.lintrunner.toml b/.lintrunner.toml
index dd75ea8f323..08e732f36db 100644
--- a/.lintrunner.toml
+++ b/.lintrunner.toml
@@ -291,6 +291,7 @@ code = 'MYPY'
 include_patterns = [
     # TODO(https://github.com/pytorch/executorch/issues/7441): Gradually start enabling all folders.
     # 'backends/**/*.py',
+    'backends/arm/**/*.py',
     'build/**/*.py',
     'codegen/**/*.py',
     # 'devtools/**/*.py',
@@ -312,6 +313,7 @@ exclude_patterns = [
     '**/third-party/**',
     'scripts/check_binary_dependencies.py',
     'profiler/test/test_profiler_e2e.py',
+    'backends/arm/test/**',
 ]
 command = [
     'python',
diff --git a/backends/arm/_passes/annotate_channels_last_dim_order_pass.py b/backends/arm/_passes/annotate_channels_last_dim_order_pass.py
index a3d168fb870..18bc1c2af69 100644
--- a/backends/arm/_passes/annotate_channels_last_dim_order_pass.py
+++ b/backends/arm/_passes/annotate_channels_last_dim_order_pass.py
@@ -209,7 +209,7 @@ def call(self, graph_module: torch.fx.GraphModule):
                     # dim_order = (2, 3, 0, 1) (https://www.mlplatform.org/tosa/tosa_spec.html#_depthwise_conv2d).
                     dim_order = self.HWCM_order
             else:
-                dim_order = tuple(range(node_data.dim()))
+                dim_order = tuple(range(node_data.dim()))  # type: ignore[assignment]
             node.meta["tosa_dim_order"] = dim_order
         # Take care of cases when:
         # 4D (NHWC) -> >4D (NCH)
diff --git a/backends/arm/_passes/arm_pass_manager.py b/backends/arm/_passes/arm_pass_manager.py
index 9bac3b037cd..2edbaafcb77 100644
--- a/backends/arm/_passes/arm_pass_manager.py
+++ b/backends/arm/_passes/arm_pass_manager.py
@@ -21,7 +21,7 @@
 from executorch.backends.arm._passes.convert_split_to_slice import (
     ConvertSplitToSlicePass,
 )
-from executorch.backends.arm._passes.convert_squeezes_to_view import (
+from executorch.backends.arm._passes.convert_squeezes_to_view import (  # type: ignore[import-not-found]
     ConvertSqueezesToViewPass,
 )
 from executorch.backends.arm._passes.decompose_div_pass import DecomposeDivPass
@@ -30,7 +30,9 @@
 )
 from executorch.backends.arm._passes.decompose_linear_pass import DecomposeLinearPass
 from executorch.backends.arm._passes.decompose_meandim_pass import DecomposeMeanDimPass
-from executorch.backends.arm._passes.decompose_select import DecomposeSelectPass
+from executorch.backends.arm._passes.decompose_select import (  # type: ignore[import-not-found]
+    DecomposeSelectPass,
+)
 from executorch.backends.arm._passes.decompose_softmaxes_pass import (
     DecomposeSoftmaxesPass,
 )
@@ -40,7 +42,7 @@
     QuantizeFullArgument,
     RetraceFoldedDtypesPass,
 )
-from executorch.backends.arm._passes.fuse_quantized_activation_pass import (
+from executorch.backends.arm._passes.fuse_quantized_activation_pass import (  # type: ignore[import-not-found]
     FuseQuantizedActivationPass,
 )
 from executorch.backends.arm._passes.insert_table_ops import InsertTableOpsPass
@@ -48,10 +50,12 @@
     KeepDimsFalseToSqueezePass,
 )
 from executorch.backends.arm._passes.match_arg_ranks_pass import MatchArgRanksPass
-from executorch.backends.arm._passes.meandim_to_averagepool_pass import (
+from executorch.backends.arm._passes.meandim_to_averagepool_pass import (  # type: ignore[attr-defined]
     ConvertMeanDimToAveragePoolPass,
 )
-from executorch.backends.arm._passes.mm_to_bmm_pass import ConvertMmToBmmPass
+from executorch.backends.arm._passes.mm_to_bmm_pass import (  # type: ignore[import-not-found]
+    ConvertMmToBmmPass,
+)
 from executorch.backends.arm._passes.remove_clone_pass import RemoveClonePass
 from executorch.backends.arm._passes.scalars_to_attribute_pass import (
     ScalarsToAttributePass,
@@ -89,7 +93,7 @@ def _tosa_080_BI_pipeline(self, exported_program: ExportedProgram) -> GraphModul
 
         self.add_pass(AnnotateDecomposedMatmulPass())
         self.add_pass(QuantizeFullArgument())
-        self.add_pass(FoldAndAnnotateQParamsPass())
+        self.add_pass(FoldAndAnnotateQParamsPass())  # type: ignore[call-arg]
         self.add_pass(RetraceFoldedDtypesPass())
         self.add_pass(InsertTableOpsPass(exported_program))
 
@@ -125,7 +129,7 @@ def _tosa_080_MI_pipeline(self, exported_program: ExportedProgram) -> GraphModul
 
         self.add_pass(AnnotateDecomposedMatmulPass())
         self.add_pass(QuantizeFullArgument())
-        self.add_pass(FoldAndAnnotateQParamsPass())
+        self.add_pass(FoldAndAnnotateQParamsPass())  # type: ignore[call-arg]
         self.add_pass(RetraceFoldedDtypesPass())
         self.add_pass(InsertTableOpsPass(exported_program))
 
diff --git a/backends/arm/_passes/arm_pass_utils.py b/backends/arm/_passes/arm_pass_utils.py
index 7377d401aba..cb43acc7fdb 100644
--- a/backends/arm/_passes/arm_pass_utils.py
+++ b/backends/arm/_passes/arm_pass_utils.py
@@ -1,5 +1,5 @@
 # Copyright (c) Meta Platforms, Inc. and affiliates.
-# Copyright 2024 Arm Limited and/or its affiliates.
+# Copyright 2024-2025 Arm Limited and/or its affiliates.
 # All rights reserved.
 #
 # This source code is licensed under the BSD-style license found in the
@@ -58,9 +58,9 @@ def get_param_tensor(
     elif is_get_attr_node(node):
         # This is a hack to support both lifted and unlifted graph
         try:
-            return getattr(node.graph.owning_module, node.target)
+            return getattr(node.graph.owning_module, node.target)  # type: ignore[arg-type]
         except AttributeError:
-            return getattr(exp_prog.graph_module, node.target)
+            return getattr(exp_prog.graph_module, node.target)  # type: ignore[arg-type]
     raise RuntimeError(f"unsupported param type, {node.op}.")
 
 
@@ -156,7 +156,7 @@ def get_node_arg(args: list | dict, key: int | str | type, default_value=None):
                 f"Out of bounds index {key} for getting value in args (of size {len(args)})"
             )
     elif isinstance(key, str):
-        return args.get(key, default_value)  # pyre-ignore[16]
+        return args.get(key, default_value)  # type: ignore[union-attr]  # pyre-ignore[16]
     elif isclass(key):
         for arg in args:
             if isinstance(arg, key):
diff --git a/backends/arm/_passes/fold_qdq_with_annotated_qparams_pass.py b/backends/arm/_passes/fold_qdq_with_annotated_qparams_pass.py
index b1e680b7bca..683e3969e79 100644
--- a/backends/arm/_passes/fold_qdq_with_annotated_qparams_pass.py
+++ b/backends/arm/_passes/fold_qdq_with_annotated_qparams_pass.py
@@ -134,7 +134,7 @@ def fold_and_annotate_arg(
             node.meta["input_qparams"][i] = input_qparams
             for n in nodes_to_remove:
                 assert n.target == dq_op
-                n.replace_all_uses_with(n.args[0])
+                n.replace_all_uses_with(n.args[0])  # type: ignore[arg-type]
                 graph_module.graph.erase_node(n)
 
     def call(self, graph_module: GraphModule) -> PassResult:
diff --git a/backends/arm/_passes/keep_dims_false_to_squeeze_pass.py b/backends/arm/_passes/keep_dims_false_to_squeeze_pass.py
index f4d369a5040..ad95379cc87 100644
--- a/backends/arm/_passes/keep_dims_false_to_squeeze_pass.py
+++ b/backends/arm/_passes/keep_dims_false_to_squeeze_pass.py
@@ -1,4 +1,4 @@
-# Copyright 2024 Arm Limited and/or its affiliates.
+# Copyright 2024-2025 Arm Limited and/or its affiliates.
 # All rights reserved.
 #
 # This source code is licensed under the BSD-style license found in the
@@ -66,7 +66,7 @@ def call(self, graph_module: torch.fx.GraphModule):
             sum_node = cast(torch.fx.Node, node)
             keep_dim = get_node_arg(
                 # pyre-ignore[6]
-                sum_node.args,
+                sum_node.args,  # type: ignore[arg-type]
                 keep_dim_index,
                 False,
             )
@@ -74,7 +74,7 @@ def call(self, graph_module: torch.fx.GraphModule):
             if keep_dim:
                 continue
 
-            dim_list = get_node_arg(sum_node.args, 1, [0])  # pyre-ignore[6]
+            dim_list = get_node_arg(sum_node.args, 1, [0])  # type: ignore[arg-type]  # pyre-ignore[6]
 
             # Add keep_dim = True arg to sum node.
             set_node_arg(sum_node, 2, True)
diff --git a/backends/arm/_passes/scalars_to_attribute_pass.py b/backends/arm/_passes/scalars_to_attribute_pass.py
index f6fe02b6ebc..78865fe33ff 100644
--- a/backends/arm/_passes/scalars_to_attribute_pass.py
+++ b/backends/arm/_passes/scalars_to_attribute_pass.py
@@ -1,4 +1,4 @@
-# Copyright 2024 Arm Limited and/or its affiliates.
+# Copyright 2024-2025 Arm Limited and/or its affiliates.
 # All rights reserved.
 #
 # This source code is licensed under the BSD-style license found in the
@@ -54,7 +54,7 @@ def call(self, graph_module: GraphModule) -> PassResult:
                 if isinstance(arg, int) and not torch.is_floating_point(
                     get_first_fake_tensor(n)
                 ):
-                    new_args.append(arg)
+                    new_args.append(arg)  # type: ignore[arg-type]
                     continue
 
                 prefix = "_tensor_constant_"
diff --git a/backends/arm/arm_backend.py b/backends/arm/arm_backend.py
index d695aec2fd8..899bafcf04c 100644
--- a/backends/arm/arm_backend.py
+++ b/backends/arm/arm_backend.py
@@ -15,7 +15,7 @@
 import os
 from typing import cast, final, List, Optional
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 from executorch.backends.arm.arm_vela import vela_compile
 from executorch.backends.arm.operators.node_visitor import get_node_visitors
 
@@ -230,7 +230,7 @@ def preprocess(  # noqa: C901
         # Converted output for this subgraph, serializer needs path early as it emits
         # const data directly. Path created and data written only in debug builds.
         tosa_graph = ts.TosaSerializer(artifact_path)
-        graph_module = ArmPassManager(tosa_spec).transform_to_backend_pipeline(
+        graph_module = ArmPassManager(tosa_spec).transform_to_backend_pipeline(  # type: ignore
             exported_program=edge_program
         )
 
diff --git a/backends/arm/arm_partitioner.py b/backends/arm/arm_partitioner.py
index cc4058c4c52..b956d65db58 100644
--- a/backends/arm/arm_partitioner.py
+++ b/backends/arm/arm_partitioner.py
@@ -10,7 +10,7 @@
 from typing import Callable, final, List, Optional, Tuple
 
 import torch
-from executorch.backends.arm.arm_backend import (
+from executorch.backends.arm.arm_backend import (  # type: ignore[attr-defined]
     ArmBackend,
 )  # usort: skip
 from executorch.backends.arm.operator_support.tosa_supported_operators import (
diff --git a/backends/arm/arm_vela.py b/backends/arm/arm_vela.py
index 918d95ba379..ef0336147af 100644
--- a/backends/arm/arm_vela.py
+++ b/backends/arm/arm_vela.py
@@ -1,4 +1,4 @@
-# Copyright 2023-2024 Arm Limited and/or its affiliates.
+# Copyright 2023-2025 Arm Limited and/or its affiliates.
 #
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
@@ -12,7 +12,7 @@
 from typing import List
 
 import numpy as np
-from ethosu.vela import vela
+from ethosu.vela import vela  # type: ignore
 
 
 # Pack either input or output tensor block, compose the related arrays into
@@ -96,13 +96,13 @@ def vela_compile(tosa_graph, args: List[str], shape_order=None):
                 block_name = block_name + b"\x00" * (16 - len(block_name))
 
                 # We need the acual unpadded block lengths for hw setup
-                block_length = struct.pack("<iiii", len(bin_blocks[key]), 0, 0, 0)
+                block_length = struct.pack("<iiii", len(bin_blocks[key]), 0, 0, 0)  # type: ignore[assignment]
 
                 # Pad block data to multiple of 16 bytes
                 block_data = bin_blocks[key]
                 block_data = block_data + b"\x00" * (15 - (len(block_data) - 1) % 16)
 
-                block = block_name + block_length + block_data
+                block = block_name + block_length + block_data  # type: ignore[operator]
                 blocks = blocks + block
 
         return blocks
diff --git a/backends/arm/operator_support/to_copy_support.py b/backends/arm/operator_support/to_copy_support.py
index 768c6a34925..27c5f24f2ee 100644
--- a/backends/arm/operator_support/to_copy_support.py
+++ b/backends/arm/operator_support/to_copy_support.py
@@ -97,7 +97,7 @@ def is_node_supported(self, node: fx.Node, tosa_spec: TosaSpecification) -> bool
         if input_dtype not in supported_dtypes:
             logger.info(
                 f"Input dtype {input_val.dtype} is not supported in "
-                f"{node.target.name()}."  # pyre-ignore[16]
+                f"{node.target.name()}."  # type: ignore[union-attr]  # pyre-ignore[16]
             )
             return False
 
@@ -107,7 +107,7 @@ def is_node_supported(self, node: fx.Node, tosa_spec: TosaSpecification) -> bool
         if output_val.dtype not in supported_dtypes[input_dtype]:
             logger.info(
                 f"Output dtype {output_val.dtype} is not supported in "
-                f"{node.target.name()} for input dtype {input_dtype}. "  # pyre-ignore[16]
+                f"{node.target.name()} for input dtype {input_dtype}. "  # type: ignore[union-attr]  # pyre-ignore[16]
                 f"Supported output types: "
                 f"{''.join(str(t) for t in supported_dtypes[input_dtype])}"
             )
@@ -118,7 +118,7 @@ def is_node_supported(self, node: fx.Node, tosa_spec: TosaSpecification) -> bool
             if node.kwargs["memory_format"] in (torch.preserve_format,):
                 logger.info(
                     f"Argument 'memory_format' is not supported for "
-                    f"{node.target.name()} right now."  # pyre-ignore[16]
+                    f"{node.target.name()} right now."  # type: ignore[union-attr]  # pyre-ignore[16]
                 )
                 return False
 
@@ -126,10 +126,10 @@ def is_node_supported(self, node: fx.Node, tosa_spec: TosaSpecification) -> bool
         if "dim_order" in node.kwargs:
             dim_order = node.kwargs["dim_order"]
             # pyre-ignore[6]
-            if dim_order != list(range(len(dim_order))):
+            if dim_order != list(range(len(dim_order))):  # type: ignore[arg-type]
                 logger.info(
                     f"Argument {dim_order=} is not supported for "
-                    f"{node.target.name()} right now."  # pyre-ignore[16]
+                    f"{node.target.name()} right now."  # type: ignore[union-attr]  # pyre-ignore[16]
                 )
                 return False
 
diff --git a/backends/arm/operator_support/tosa_supported_operators.py b/backends/arm/operator_support/tosa_supported_operators.py
index c3102a86a48..68c9843e52e 100644
--- a/backends/arm/operator_support/tosa_supported_operators.py
+++ b/backends/arm/operator_support/tosa_supported_operators.py
@@ -137,5 +137,5 @@ def is_node_supported(self, submodules, node: fx.Node) -> bool:
     def is_node_supported_custom(self, node: fx.Node) -> bool:
         tosa_checks = get_registered_tosa_support_checks(self.tosa_spec)
         if node.target in tosa_checks.keys():
-            return tosa_checks[node.target].is_node_supported(node, self.tosa_spec)
+            return tosa_checks[node.target].is_node_supported(node, self.tosa_spec)  # type: ignore[index]
         return False
diff --git a/backends/arm/operators/node_visitor.py b/backends/arm/operators/node_visitor.py
index 8609e5e3918..b8fd09ea98c 100644
--- a/backends/arm/operators/node_visitor.py
+++ b/backends/arm/operators/node_visitor.py
@@ -1,4 +1,4 @@
-# Copyright 2023-2024 Arm Limited and/or its affiliates.
+# Copyright 2023-2025 Arm Limited and/or its affiliates.
 #
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
@@ -7,7 +7,7 @@
 
 from typing import Dict, List
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 import torch
 from executorch.backends.arm.tosa_mapping import TosaArg
 from executorch.backends.arm.tosa_specification import TosaSpecification
@@ -44,7 +44,7 @@ def define_node(
 
 
 # container for all node visitors
-_node_visitor_dicts = {
+_node_visitor_dicts = {  # type: ignore[var-annotated]
     TosaSpecification.create_from_string("TOSA-0.80+BI"): {},
     TosaSpecification.create_from_string("TOSA-0.80+MI"): {},
 }
diff --git a/backends/arm/operators/op_add.py b/backends/arm/operators/op_add.py
index 74f00354edf..ccdeb2c1bcf 100644
--- a/backends/arm/operators/op_add.py
+++ b/backends/arm/operators/op_add.py
@@ -1,4 +1,4 @@
-# Copyright 2023-2024 Arm Limited and/or its affiliates.
+# Copyright 2023-2025 Arm Limited and/or its affiliates.
 #
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
@@ -10,7 +10,7 @@
 import executorch.backends.arm.tosa_quant_utils as tqutils
 import executorch.backends.arm.tosa_utils as tutils
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 from executorch.backends.arm.operators.node_visitor import (
     NodeVisitor,
     register_node_visitor,
@@ -75,7 +75,7 @@ def define_node(
         if output.dtype == ts.DType.INT8:
             # Scale output back to 8 bit
             # pyre-ignore
-            tqutils.insert_rescale_op_to_int8(tosa_graph, add_output, scale_back, node)
+            tqutils.insert_rescale_op_to_int8(tosa_graph, add_output, scale_back, node)  # type: ignore[possibly-undefined]
 
 
 @register_node_visitor
diff --git a/backends/arm/operators/op_avg_pool2d.py b/backends/arm/operators/op_avg_pool2d.py
index fecddac6591..e300b3ed016 100644
--- a/backends/arm/operators/op_avg_pool2d.py
+++ b/backends/arm/operators/op_avg_pool2d.py
@@ -1,4 +1,4 @@
-# Copyright 2023-2024 Arm Limited and/or its affiliates.
+# Copyright 2023-2025 Arm Limited and/or its affiliates.
 #
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
@@ -6,7 +6,7 @@
 # pyre-unsafe
 from typing import List
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 import torch
 
 # pyre-fixme[21]: ' Could not find a module corresponding to import `executorch.backends.arm._passes.fold_qdq_with_annotated_qparams_pass`
diff --git a/backends/arm/operators/op_batch_norm.py b/backends/arm/operators/op_batch_norm.py
index ce5998cb721..dc423d0b4a2 100644
--- a/backends/arm/operators/op_batch_norm.py
+++ b/backends/arm/operators/op_batch_norm.py
@@ -1,4 +1,4 @@
-# Copyright 2023-2024 Arm Limited and/or its affiliates.
+# Copyright 2023-2025 Arm Limited and/or its affiliates.
 #
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
@@ -6,7 +6,7 @@
 # pyre-unsafe
 from typing import List
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 import torch
 from executorch.backends.arm.operators.node_visitor import (
     NodeVisitor,
diff --git a/backends/arm/operators/op_bmm.py b/backends/arm/operators/op_bmm.py
index 83d3df27014..d3261ebde0c 100644
--- a/backends/arm/operators/op_bmm.py
+++ b/backends/arm/operators/op_bmm.py
@@ -1,4 +1,4 @@
-# Copyright 2024 Arm Limited and/or its affiliates.
+# Copyright 2024-2025 Arm Limited and/or its affiliates.
 # All rights reserved.
 #
 # This source code is licensed under the BSD-style license found in the
@@ -7,7 +7,7 @@
 # pyre-unsafe
 from typing import List
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 import torch
 
 # pyre-fixme[21]: 'Could not find a module corresponding to import `executorch.backends.arm._passes.fold_qdq_with_annotated_qparams_pass`.'
@@ -75,14 +75,14 @@ def define_node(
         if output.dtype == ts.DType.INT8:
             output_qparams = get_output_qparams(node)[0]  # pyre-ignore[16]
             final_output_scale = (
-                input_qparams[0].scale * input_qparams[1].scale  # pyre-ignore[61]
+                input_qparams[0].scale * input_qparams[1].scale  # type: ignore[possibly-undefined]  # pyre-ignore[61]
             ) / output_qparams.scale
 
             build_rescale(
                 tosa_fb=tosa_graph,
                 scale=final_output_scale,
                 # pyre-ignore[61]: Uninitialized local [61]: Local variable `bmm_result` is undefined, or not always defined.
-                input_node=bmm_result,
+                input_node=bmm_result,  # type: ignore[possibly-undefined]
                 output_name=output.name,
                 output_type=ts.DType.INT8,
                 output_shape=bmm_result.shape,
diff --git a/backends/arm/operators/op_cat.py b/backends/arm/operators/op_cat.py
index e249942d0b7..f786395cc39 100644
--- a/backends/arm/operators/op_cat.py
+++ b/backends/arm/operators/op_cat.py
@@ -1,4 +1,4 @@
-# Copyright 2024 Arm Limited and/or its affiliates.
+# Copyright 2024-2025 Arm Limited and/or its affiliates.
 #
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
@@ -7,7 +7,7 @@
 
 from typing import List
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 from executorch.backends.arm.operators.node_visitor import (
     NodeVisitor,
     register_node_visitor,
diff --git a/backends/arm/operators/op_conv2d.py b/backends/arm/operators/op_conv2d.py
index 42156da0132..f97e408a02a 100644
--- a/backends/arm/operators/op_conv2d.py
+++ b/backends/arm/operators/op_conv2d.py
@@ -1,4 +1,4 @@
-# Copyright 2023-2024 Arm Limited and/or its affiliates.
+# Copyright 2023-2025 Arm Limited and/or its affiliates.
 #
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
@@ -6,7 +6,7 @@
 # pyre-unsafe
 from typing import List
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 import torch
 
 # pyre-fixme[21]: 'Could not find a module corresponding to import `executorch.backends.arm._passes.fold_qdq_with_annotated_qparams_pass`.'
@@ -165,13 +165,13 @@ def define_node(
         # integer value domain of the next op. Otherwise return float32 output.
         if inputs[0].dtype == ts.DType.INT8:
             # Get scale_factor from input, weight, and output.
-            input_scale = input_qparams[0].scale  # pyre-ignore [61]
+            input_scale = input_qparams[0].scale  # type: ignore[possibly-undefined]  # pyre-ignore [61]
             weight_scale = input_qparams[1].scale  # pyre-ignore [61]
             output_qargs = get_output_qparams(node)  # pyre-ignore [16]
             build_rescale_conv_output(
                 tosa_graph,
                 # pyre-fixme[61]: Uninitialized local [61]: Local variable `conv2d_res` is undefined, or not always defined.
-                conv2d_res,
+                conv2d_res,  # type: ignore[possibly-undefined]
                 output.name,
                 output.dtype,
                 input_scale,
diff --git a/backends/arm/operators/op_eq.py b/backends/arm/operators/op_eq.py
index e6e2492aec0..02fc89099e0 100644
--- a/backends/arm/operators/op_eq.py
+++ b/backends/arm/operators/op_eq.py
@@ -9,7 +9,7 @@
 
 import executorch.backends.arm.tosa_quant_utils as tqutils
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 from executorch.backends.arm.operators.node_visitor import (
     NodeVisitor,
     register_node_visitor,
diff --git a/backends/arm/operators/op_exp.py b/backends/arm/operators/op_exp.py
index 46f49809750..4b8232ef6e7 100644
--- a/backends/arm/operators/op_exp.py
+++ b/backends/arm/operators/op_exp.py
@@ -1,4 +1,4 @@
-# Copyright 2024 Arm Limited and/or its affiliates.
+# Copyright 2024-2025 Arm Limited and/or its affiliates.
 #
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
@@ -6,7 +6,7 @@
 # pyre-unsafe
 from typing import List
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 from executorch.backends.arm.operators.node_visitor import (
     NodeVisitor,
     register_node_visitor,
diff --git a/backends/arm/operators/op_full.py b/backends/arm/operators/op_full.py
index 7964e58226c..f06b9873e63 100644
--- a/backends/arm/operators/op_full.py
+++ b/backends/arm/operators/op_full.py
@@ -1,4 +1,4 @@
-# Copyright 2024 Arm Limited and/or its affiliates.
+# Copyright 2024-2025 Arm Limited and/or its affiliates.
 #
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
@@ -8,7 +8,7 @@
 
 import numpy as np
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 from executorch.backends.arm.operators.node_visitor import (
     NodeVisitor,
     register_node_visitor,
@@ -40,7 +40,7 @@ def define_node(
         if output.dtype == ts.DType.INT8:
             fill_dtype = np.int8
         else:
-            fill_dtype = np.float32
+            fill_dtype = np.float32  # type: ignore[assignment]
         data = np.full(shape, value, dtype=fill_dtype)
 
         tosa_graph.addConst(shape, output.dtype, data, node.name + "full-const")
diff --git a/backends/arm/operators/op_ge.py b/backends/arm/operators/op_ge.py
index 810b40bb1ad..e4de12f3327 100644
--- a/backends/arm/operators/op_ge.py
+++ b/backends/arm/operators/op_ge.py
@@ -9,7 +9,7 @@
 
 import executorch.backends.arm.tosa_quant_utils as tqutils
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 from executorch.backends.arm.operators.node_visitor import (
     NodeVisitor,
     register_node_visitor,
diff --git a/backends/arm/operators/op_get_item.py b/backends/arm/operators/op_get_item.py
index f7372262c6e..577a8c8d2ea 100644
--- a/backends/arm/operators/op_get_item.py
+++ b/backends/arm/operators/op_get_item.py
@@ -1,4 +1,4 @@
-# Copyright 2023-2024 Arm Limited and/or its affiliates.
+# Copyright 2023-2025 Arm Limited and/or its affiliates.
 #
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
@@ -6,7 +6,7 @@
 # pyre-unsafe
 from typing import List
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 import torch
 from executorch.backends.arm.operators.node_visitor import (
     NodeVisitor,
diff --git a/backends/arm/operators/op_gt.py b/backends/arm/operators/op_gt.py
index 7a22db66862..65cf8197bdc 100644
--- a/backends/arm/operators/op_gt.py
+++ b/backends/arm/operators/op_gt.py
@@ -9,7 +9,7 @@
 
 import executorch.backends.arm.tosa_quant_utils as tqutils
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 from executorch.backends.arm.operators.node_visitor import (
     NodeVisitor,
     register_node_visitor,
diff --git a/backends/arm/operators/op_hardtanh.py b/backends/arm/operators/op_hardtanh.py
index c971b50b665..fc0ee552a9f 100644
--- a/backends/arm/operators/op_hardtanh.py
+++ b/backends/arm/operators/op_hardtanh.py
@@ -6,7 +6,7 @@
 # pyre-unsafe
 from typing import List
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 import torch
 
 # pyre-fixme[21]: 'Could not find a module corresponding to import `executorch.backends.arm._passes.fold_qdq_with_annotated_qparams_pass`.'
diff --git a/backends/arm/operators/op_le.py b/backends/arm/operators/op_le.py
index ee6929617e4..8fea2b92088 100644
--- a/backends/arm/operators/op_le.py
+++ b/backends/arm/operators/op_le.py
@@ -9,7 +9,7 @@
 
 import executorch.backends.arm.tosa_quant_utils as tqutils
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 from executorch.backends.arm.operators.node_visitor import (
     NodeVisitor,
     register_node_visitor,
diff --git a/backends/arm/operators/op_log.py b/backends/arm/operators/op_log.py
index 868eeb94431..7f664900b31 100644
--- a/backends/arm/operators/op_log.py
+++ b/backends/arm/operators/op_log.py
@@ -1,4 +1,4 @@
-# Copyright 2024 Arm Limited and/or its affiliates.
+# Copyright 2024-2025 Arm Limited and/or its affiliates.
 #
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
@@ -6,7 +6,7 @@
 # pyre-unsafe
 from typing import List
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 from executorch.backends.arm.operators.node_visitor import (
     NodeVisitor,
     register_node_visitor,
diff --git a/backends/arm/operators/op_lt.py b/backends/arm/operators/op_lt.py
index 20bac97af48..da93ab41799 100644
--- a/backends/arm/operators/op_lt.py
+++ b/backends/arm/operators/op_lt.py
@@ -9,7 +9,7 @@
 
 import executorch.backends.arm.tosa_quant_utils as tqutils
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 from executorch.backends.arm.operators.node_visitor import (
     NodeVisitor,
     register_node_visitor,
diff --git a/backends/arm/operators/op_max.py b/backends/arm/operators/op_max.py
index 660a2cf0afd..35a635de137 100644
--- a/backends/arm/operators/op_max.py
+++ b/backends/arm/operators/op_max.py
@@ -1,4 +1,4 @@
-# Copyright 2024 Arm Limited and/or its affiliates.
+# Copyright 2024-2025 Arm Limited and/or its affiliates.
 #
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
@@ -8,7 +8,7 @@
 from typing import List
 
 import executorch.backends.arm.tosa_quant_utils as tqutils
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 
 # pyre-fixme[21]: 'Could not find a module corresponding to import `executorch.backends.arm._passes.fold_qdq_with_annotated_qparams_pass`.'
 from executorch.backends.arm._passes.fold_qdq_with_annotated_qparams_pass import (
diff --git a/backends/arm/operators/op_max_pool2d.py b/backends/arm/operators/op_max_pool2d.py
index 6cb5f0490e9..f32300f561d 100644
--- a/backends/arm/operators/op_max_pool2d.py
+++ b/backends/arm/operators/op_max_pool2d.py
@@ -1,4 +1,4 @@
-# Copyright 2024 Arm Limited and/or its affiliates.
+# Copyright 2024-2025 Arm Limited and/or its affiliates.
 #
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
@@ -6,7 +6,7 @@
 # pyre-unsafe
 from typing import List
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 import torch
 
 # pyre-fixme[21]: 'Could not find a module corresponding to import `executorch.backends.arm._passes.fold_qdq_with_annotated_qparams_pass`.'
diff --git a/backends/arm/operators/op_min.py b/backends/arm/operators/op_min.py
index 2282d9e1cf1..a409acf1ae8 100644
--- a/backends/arm/operators/op_min.py
+++ b/backends/arm/operators/op_min.py
@@ -1,4 +1,4 @@
-# Copyright 2024 Arm Limited and/or its affiliates.
+# Copyright 2024-2025 Arm Limited and/or its affiliates.
 #
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
@@ -9,7 +9,7 @@
 
 import executorch.backends.arm.tosa_quant_utils as tqutils
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 
 # pyre-fixme[21]: 'Could not find a module corresponding to import `executorch.backends.arm._passes.fold_qdq_with_annotated_qparams_pass`.'
 from executorch.backends.arm._passes.fold_qdq_with_annotated_qparams_pass import (
diff --git a/backends/arm/operators/op_mul.py b/backends/arm/operators/op_mul.py
index c6a315d4452..ef886de11e8 100644
--- a/backends/arm/operators/op_mul.py
+++ b/backends/arm/operators/op_mul.py
@@ -1,4 +1,4 @@
-# Copyright 2024 Arm Limited and/or its affiliates.
+# Copyright 2024-2025 Arm Limited and/or its affiliates.
 #
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
@@ -10,7 +10,7 @@
 import executorch.backends.arm.tosa_quant_utils as tqutils
 import executorch.backends.arm.tosa_utils as tutils
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 import torch
 
 # pyre-fixme[21]: 'Could not find a module corresponding to import `executorch.backends.arm._passes.fold_qdq_with_annotated_qparams_pass`.'
diff --git a/backends/arm/operators/op_permute.py b/backends/arm/operators/op_permute.py
index 16d3d4a04e0..103ae1b9a2f 100644
--- a/backends/arm/operators/op_permute.py
+++ b/backends/arm/operators/op_permute.py
@@ -1,4 +1,4 @@
-# Copyright 2023-2024 Arm Limited and/or its affiliates.
+# Copyright 2023-2025 Arm Limited and/or its affiliates.
 #
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
@@ -7,7 +7,7 @@
 
 from typing import List
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 import torch
 from executorch.backends.arm.operators.node_visitor import (
     NodeVisitor,
diff --git a/backends/arm/operators/op_reciprocal.py b/backends/arm/operators/op_reciprocal.py
index 121b78fed6f..5410e1dd99a 100644
--- a/backends/arm/operators/op_reciprocal.py
+++ b/backends/arm/operators/op_reciprocal.py
@@ -1,4 +1,4 @@
-# Copyright 2023-2024 Arm Limited and/or its affiliates.
+# Copyright 2023-2025 Arm Limited and/or its affiliates.
 #
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
@@ -6,7 +6,7 @@
 # pyre-unsafe
 from typing import List
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 import torch
 from executorch.backends.arm.operators.node_visitor import (
     NodeVisitor,
diff --git a/backends/arm/operators/op_relu.py b/backends/arm/operators/op_relu.py
index b5ffa2aa70c..c37e4b3e75d 100644
--- a/backends/arm/operators/op_relu.py
+++ b/backends/arm/operators/op_relu.py
@@ -5,7 +5,7 @@
 
 # pyre-unsafe
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 import torch.fx
 
 # pyre-fixme[21]: 'Could not find a module corresponding to import `executorch.backends.arm._passes.fold_qdq_with_annotated_qparams_pass`.'
diff --git a/backends/arm/operators/op_repeat.py b/backends/arm/operators/op_repeat.py
index fd76a52052e..b97d7023ef0 100644
--- a/backends/arm/operators/op_repeat.py
+++ b/backends/arm/operators/op_repeat.py
@@ -1,11 +1,11 @@
-# Copyright 2024 Arm Limited and/or its affiliates.
+# Copyright 2024-2025 Arm Limited and/or its affiliates.
 #
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
 
 # pyre-unsafe
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 import torch
 from executorch.backends.arm.operators.node_visitor import (
     NodeVisitor,
diff --git a/backends/arm/operators/op_rshift.py b/backends/arm/operators/op_rshift.py
index 2c1f4d5bbeb..ac61cca6a98 100644
--- a/backends/arm/operators/op_rshift.py
+++ b/backends/arm/operators/op_rshift.py
@@ -1,4 +1,4 @@
-# Copyright 2024 Arm Limited and/or its affiliates.
+# Copyright 2024-2025 Arm Limited and/or its affiliates.
 # All rights reserved.
 #
 # This source code is licensed under the BSD-style license found in the
@@ -6,7 +6,7 @@
 
 from typing import List
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 import torch
 from executorch.backends.arm.operators.node_visitor import (
     NodeVisitor,
diff --git a/backends/arm/operators/op_rsqrt.py b/backends/arm/operators/op_rsqrt.py
index 1cc3e8fcff5..0fbb203b081 100644
--- a/backends/arm/operators/op_rsqrt.py
+++ b/backends/arm/operators/op_rsqrt.py
@@ -1,4 +1,4 @@
-# Copyright 2024 Arm Limited and/or its affiliates.
+# Copyright 2024-2025 Arm Limited and/or its affiliates.
 #
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
@@ -6,7 +6,7 @@
 # pyre-unsafe
 from typing import List
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 import torch
 from executorch.backends.arm.operators.node_visitor import (
     NodeVisitor,
diff --git a/backends/arm/operators/op_sigmoid.py b/backends/arm/operators/op_sigmoid.py
index 0c28c0ed008..118c813dcf4 100644
--- a/backends/arm/operators/op_sigmoid.py
+++ b/backends/arm/operators/op_sigmoid.py
@@ -1,4 +1,4 @@
-# Copyright 2024 Arm Limited and/or its affiliates.
+# Copyright 2024-2025 Arm Limited and/or its affiliates.
 #
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
@@ -6,7 +6,7 @@
 # pyre-unsafe
 from typing import List
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 from executorch.backends.arm.operators.node_visitor import (
     NodeVisitor,
     register_node_visitor,
diff --git a/backends/arm/operators/op_slice.py b/backends/arm/operators/op_slice.py
index 9327e005b67..7f4804af587 100644
--- a/backends/arm/operators/op_slice.py
+++ b/backends/arm/operators/op_slice.py
@@ -1,4 +1,4 @@
-# Copyright 2024 Arm Limited and/or its affiliates.
+# Copyright 2024-2025 Arm Limited and/or its affiliates.
 #
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
@@ -7,7 +7,7 @@
 
 from typing import List
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 from executorch.backends.arm.operators.node_visitor import (
     NodeVisitor,
     register_node_visitor,
diff --git a/backends/arm/operators/op_sub.py b/backends/arm/operators/op_sub.py
index 0c569a6ffd8..6cd422095ab 100644
--- a/backends/arm/operators/op_sub.py
+++ b/backends/arm/operators/op_sub.py
@@ -1,4 +1,4 @@
-# Copyright 2023-2024 Arm Limited and/or its affiliates.
+# Copyright 2023-2025 Arm Limited and/or its affiliates.
 #
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
@@ -10,7 +10,7 @@
 import executorch.backends.arm.tosa_quant_utils as tqutils
 import executorch.backends.arm.tosa_utils as tutils
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 from executorch.backends.arm.operators.node_visitor import (
     NodeVisitor,
     register_node_visitor,
@@ -75,7 +75,7 @@ def define_node(
         if output.dtype == ts.DType.INT8:
             # Scale output back to 8 bit
             # pyre-ignore
-            tqutils.insert_rescale_op_to_int8(tosa_graph, sub_output, scale_back, node)
+            tqutils.insert_rescale_op_to_int8(tosa_graph, sub_output, scale_back, node)  # type: ignore[possibly-undefined]
 
 
 @register_node_visitor
diff --git a/backends/arm/operators/op_sum.py b/backends/arm/operators/op_sum.py
index dcc194a6567..b5b388b3352 100644
--- a/backends/arm/operators/op_sum.py
+++ b/backends/arm/operators/op_sum.py
@@ -1,4 +1,4 @@
-# Copyright 2023-2024 Arm Limited and/or its affiliates.
+# Copyright 2023-2025 Arm Limited and/or its affiliates.
 #
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
@@ -10,7 +10,7 @@
 import executorch.backends.arm.tosa_quant_utils as tqutils
 import executorch.backends.arm.tosa_utils as tutils
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 from executorch.backends.arm.operators.node_visitor import (
     NodeVisitor,
     register_node_visitor,
diff --git a/backends/arm/operators/op_table.py b/backends/arm/operators/op_table.py
index bfaaf4578ed..d8d9b69d2f1 100644
--- a/backends/arm/operators/op_table.py
+++ b/backends/arm/operators/op_table.py
@@ -1,4 +1,4 @@
-# Copyright 2024 Arm Limited and/or its affiliates.
+# Copyright 2024-2025 Arm Limited and/or its affiliates.
 #
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
@@ -9,7 +9,7 @@
 
 import numpy as np
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 import torch
 from executorch.backends.arm.operators.node_visitor import (
     NodeVisitor,
@@ -30,9 +30,9 @@ def define_node(
         inputs: List[TosaArg],
         output: TosaArg,
     ) -> None:
-        assert node.name in self._exported_program.state_dict.keys()
+        assert node.name in self._exported_program.state_dict.keys()  # type: ignore[union-attr]
         assert inputs[0].dtype == output.dtype == ts.DType.INT8
-        table = self._exported_program.state_dict[node.name]
+        table = self._exported_program.state_dict[node.name]  # type: ignore[union-attr]
         table_attr = ts.TosaSerializerAttribute()
         table_attr.TableAttribute(np.array(table))
         tosa_graph.addOperator(
diff --git a/backends/arm/operators/op_tanh.py b/backends/arm/operators/op_tanh.py
index a1e91be4ffb..7961b14f2ae 100644
--- a/backends/arm/operators/op_tanh.py
+++ b/backends/arm/operators/op_tanh.py
@@ -1,4 +1,4 @@
-# Copyright 2024 Arm Limited and/or its affiliates.
+# Copyright 2024-2025 Arm Limited and/or its affiliates.
 #
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
@@ -6,7 +6,7 @@
 # pyre-unsafe
 from typing import List
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 from executorch.backends.arm.operators.node_visitor import (
     NodeVisitor,
     register_node_visitor,
diff --git a/backends/arm/operators/op_to_copy.py b/backends/arm/operators/op_to_copy.py
index 256e54f3a2d..feaec3a41e9 100644
--- a/backends/arm/operators/op_to_copy.py
+++ b/backends/arm/operators/op_to_copy.py
@@ -1,4 +1,4 @@
-# Copyright 2024 Arm Limited and/or its affiliates.
+# Copyright 2024-2025 Arm Limited and/or its affiliates.
 #
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
@@ -6,9 +6,9 @@
 # pyre-unsafe
 from typing import List
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 import torch
-import tosa.Op as TosaOp
+import tosa.Op as TosaOp  # type: ignore
 
 from executorch.backends.arm.operators.node_visitor import (
     NodeVisitor,
diff --git a/backends/arm/operators/op_to_dim_order_copy.py b/backends/arm/operators/op_to_dim_order_copy.py
index c2ec620b821..397979a439d 100644
--- a/backends/arm/operators/op_to_dim_order_copy.py
+++ b/backends/arm/operators/op_to_dim_order_copy.py
@@ -6,9 +6,9 @@
 # pyre-unsafe
 from typing import List
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 import torch
-import tosa.Op as TosaOp
+import tosa.Op as TosaOp  # type: ignore
 
 from executorch.backends.arm.operators.node_visitor import (
     NodeVisitor,
diff --git a/backends/arm/operators/op_transpose.py b/backends/arm/operators/op_transpose.py
index 42675be34b5..4e7195ecdac 100644
--- a/backends/arm/operators/op_transpose.py
+++ b/backends/arm/operators/op_transpose.py
@@ -1,4 +1,4 @@
-# Copyright 2024 Arm Limited and/or its affiliates.
+# Copyright 2024-2025 Arm Limited and/or its affiliates.
 #
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
@@ -7,7 +7,7 @@
 
 from typing import List
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 import torch
 from executorch.backends.arm.operators.node_visitor import (
     NodeVisitor,
diff --git a/backends/arm/operators/op_upsample_nearest2d.py b/backends/arm/operators/op_upsample_nearest2d.py
index 68fcb521d90..38e4087d38d 100644
--- a/backends/arm/operators/op_upsample_nearest2d.py
+++ b/backends/arm/operators/op_upsample_nearest2d.py
@@ -1,4 +1,4 @@
-# Copyright 2024 Arm Limited and/or its affiliates.
+# Copyright 2024-2025 Arm Limited and/or its affiliates.
 #
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
@@ -6,7 +6,7 @@
 # pyre-unsafe
 from typing import List
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 import torch
 from executorch.backends.arm.operators.node_visitor import (
     NodeVisitor,
@@ -16,7 +16,7 @@
 from executorch.backends.arm.tosa_utils import get_resize_parameters, tosa_shape
 from serializer.tosa_serializer import TosaOp
 
-from tosa.ResizeMode import ResizeMode
+from tosa.ResizeMode import ResizeMode  # type: ignore
 
 
 @register_node_visitor
diff --git a/backends/arm/operators/op_view.py b/backends/arm/operators/op_view.py
index 3489795ed50..119e32fa58f 100644
--- a/backends/arm/operators/op_view.py
+++ b/backends/arm/operators/op_view.py
@@ -1,4 +1,4 @@
-# Copyright 2023-2024 Arm Limited and/or its affiliates.
+# Copyright 2023-2025 Arm Limited and/or its affiliates.
 #
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
@@ -6,9 +6,9 @@
 # pyre-unsafe
 from typing import List
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 import torch
-import tosa.Op as TosaOp
+import tosa.Op as TosaOp  # type: ignore
 
 from executorch.backends.arm.operators.node_visitor import (
     NodeVisitor,
diff --git a/backends/arm/process_node.py b/backends/arm/process_node.py
index 36a1567df93..a83ead987ed 100644
--- a/backends/arm/process_node.py
+++ b/backends/arm/process_node.py
@@ -8,7 +8,7 @@
 from typing import cast, Dict
 
 import numpy as np
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 import torch
 import torch.fx
 from executorch.backends.arm.operators.node_visitor import NodeVisitor
@@ -36,9 +36,9 @@ def process_call_function(
 
     # Visiting each Node
     # pyre-ignore[16]: Undefined attribute.
-    if node.target.__name__ in node_visitors:
+    if node.target.__name__ in node_visitors:  # type: ignore[union-attr]
         # pyre-ignore[16]: Undefined attribute.
-        node_visitors[node.target.__name__].define_node(
+        node_visitors[node.target.__name__].define_node(  # type: ignore[union-attr]
             node,
             tosa_graph,
             inputs,
diff --git a/backends/arm/quantizer/arm_quantizer.py b/backends/arm/quantizer/arm_quantizer.py
index cba66cfe561..c1a017fa1dc 100644
--- a/backends/arm/quantizer/arm_quantizer.py
+++ b/backends/arm/quantizer/arm_quantizer.py
@@ -20,8 +20,12 @@
 from executorch.backends.arm._passes.arm_pass_manager import ArmPassManager
 
 from executorch.backends.arm.quantizer import arm_quantizer_utils
-from executorch.backends.arm.quantizer.arm_quantizer_utils import mark_node_as_annotated
-from executorch.backends.arm.quantizer.quantization_annotator import annotate_graph
+from executorch.backends.arm.quantizer.arm_quantizer_utils import (  # type: ignore[attr-defined]
+    mark_node_as_annotated,
+)
+from executorch.backends.arm.quantizer.quantization_annotator import (  # type: ignore[import-not-found]
+    annotate_graph,
+)
 
 from executorch.backends.arm.quantizer.quantization_config import QuantizationConfig
 from executorch.backends.arm.tosa_specification import TosaSpecification
@@ -253,7 +257,7 @@ def transform_for_annotation(self, model: GraphModule) -> GraphModule:
         Currently transforms scalar values to tensor attributes.
         """
 
-        return ArmPassManager(self.tosa_spec).transform_for_annotation_pipeline(
+        return ArmPassManager(self.tosa_spec).transform_for_annotation_pipeline(  # type: ignore[arg-type]
             graph_module=model
         )
 
diff --git a/backends/arm/quantizer/quantization_annotator.py b/backends/arm/quantizer/quantization_annotator.py
index f2a124f2790..1daf7f83c94 100644
--- a/backends/arm/quantizer/quantization_annotator.py
+++ b/backends/arm/quantizer/quantization_annotator.py
@@ -55,7 +55,7 @@ def _is_ok_for_quantization(
 
     for n_arg in _as_list(node.args[quant_property.index]):
         assert isinstance(n_arg, Node)
-        if not arm_quantizer_utils.is_ok_for_quantization(n_arg, gm):
+        if not arm_quantizer_utils.is_ok_for_quantization(n_arg, gm):  # type: ignore[attr-defined]
             return False
 
     return True
@@ -77,7 +77,7 @@ def _annotate_input(node: Node, quant_property: _QuantProperty):
         assert isinstance(n_arg, Node)
         _annotate_input_qspec_map(node, n_arg, qspec)
         if quant_property.mark_annotated:
-            arm_quantizer_utils.mark_node_as_annotated(n_arg)
+            arm_quantizer_utils.mark_node_as_annotated(n_arg)  # type: ignore[attr-defined]
 
 
 def _annotate_output(node: Node, quant_property: _QuantProperty):
@@ -107,7 +107,7 @@ def _match_pattern(
         child = next(iter(node.users))
     elif node.target in pattern[1]:
         assert len(node.args) != 0
-        parent = node.args[0]
+        parent = node.args[0]  # type: ignore[assignment]
         child = node
     else:
         return False
@@ -259,23 +259,23 @@ def any_or_hardtanh_min_zero(n: Node):
         torch.ops.aten.minimum.default,
         torch.ops.aten.maximum.default,
     ):
-        shared_qspec = SharedQuantizationSpec((node.args[0], node))
+        shared_qspec = SharedQuantizationSpec((node.args[0], node))  # type: ignore[arg-type]
         quant_properties.quant_inputs = [
             _QuantProperty(0, input_act_qspec),
             _QuantProperty(
-                1, input_act_qspec if node.args[0] == node.args[1] else shared_qspec
+                1, input_act_qspec if node.args[0] == node.args[1] else shared_qspec  # type: ignore[arg-type]
             ),
         ]
-        quant_properties.quant_output = _QuantProperty(0, shared_qspec)
+        quant_properties.quant_output = _QuantProperty(0, shared_qspec)  # type: ignore[arg-type]
     elif node.target == torch.ops.aten.adaptive_avg_pool2d.default:
         input_qspec = (
-            SharedQuantizationSpec(node.args[0])
-            if arm_quantizer_utils.is_output_annotated(node.args[0])
+            SharedQuantizationSpec(node.args[0])  # type: ignore[arg-type]
+            if arm_quantizer_utils.is_output_annotated(node.args[0])  # type: ignore
             else input_act_qspec
         )
-        quant_properties.quant_inputs = [_QuantProperty(0, input_qspec)]
+        quant_properties.quant_inputs = [_QuantProperty(0, input_qspec)]  # type: ignore[arg-type]
         quant_properties.quant_output = _QuantProperty(
-            0, SharedQuantizationSpec((node.args[0], node))
+            0, SharedQuantizationSpec((node.args[0], node))  # type: ignore[arg-type]
         )
     elif node.target in (
         torch.ops.aten.cat.default,
@@ -290,19 +290,19 @@ def any_or_hardtanh_min_zero(n: Node):
             _QuantProperty(
                 0,
                 [
-                    input_act_qspec if n == node.args[0][0] else shared_qspec
+                    input_act_qspec if n == node.args[0][0] else shared_qspec  # type: ignore[misc]
                     for n in node.args[0]
                 ],
             )
         ]
-        quant_properties.quant_output = _QuantProperty(0, shared_qspec)
+        quant_properties.quant_output = _QuantProperty(0, shared_qspec)  # type: ignore[arg-type]
     elif node.target in _one_to_one:
         quant_properties.quant_inputs = [_QuantProperty(0, input_act_qspec)]
         quant_properties.quant_output = _QuantProperty(0, output_act_qspec)
     elif node.target in _one_to_one_shared_input_qspec:
         quant_properties.quant_inputs = [_QuantProperty(0, input_act_qspec)]
         quant_properties.quant_output = _QuantProperty(
-            0, SharedQuantizationSpec((node.args[0], node))
+            0, SharedQuantizationSpec((node.args[0], node))  # type: ignore[arg-type]
         )
     elif node.target in [
         torch.ops.aten.eq.Tensor,
@@ -311,26 +311,26 @@ def any_or_hardtanh_min_zero(n: Node):
         torch.ops.aten.le.Tensor,
         torch.ops.aten.lt.Tensor,
     ]:
-        shared_qspec = SharedQuantizationSpec((node.args[0], node))
+        shared_qspec = SharedQuantizationSpec((node.args[0], node))  # type: ignore[arg-type]
         quant_properties.quant_inputs = [
             _QuantProperty(0, input_act_qspec),
             _QuantProperty(
-                1, input_act_qspec if node.args[0] == node.args[1] else shared_qspec
+                1, input_act_qspec if node.args[0] == node.args[1] else shared_qspec  # type: ignore[arg-type]
             ),
         ]
         quant_properties.quant_output = None
     elif node.target in _parent_shared_qspec:
         if not isinstance(node.args[0], Node):
-            return None
+            return None  # type: ignore[return-value]
 
-        if not arm_quantizer_utils.is_output_annotated(node.args[0]):
-            return None
+        if not arm_quantizer_utils.is_output_annotated(node.args[0]):  # type: ignore[attr-defined]
+            return None  # type: ignore[return-value]
 
         shared_qspec = SharedQuantizationSpec(node.args[0])
-        quant_properties.quant_inputs = [_QuantProperty(0, shared_qspec)]
-        quant_properties.quant_output = _QuantProperty(0, shared_qspec)
+        quant_properties.quant_inputs = [_QuantProperty(0, shared_qspec)]  # type: ignore[arg-type]
+        quant_properties.quant_output = _QuantProperty(0, shared_qspec)  # type: ignore[arg-type]
     else:
-        return None
+        return None  # type: ignore[return-value]
 
     # Don't check if operator.getitem is ok for quantization, it's always ok
     if node.target == operator.getitem:
@@ -340,16 +340,16 @@ def any_or_hardtanh_min_zero(n: Node):
     # provided QuantProperties
     for quant_property in quant_properties.quant_inputs:
         if not _is_ok_for_quantization(node, quant_property, gm):
-            return None
+            return None  # type: ignore[return-value]
 
     if quant_properties.quant_output is not None:
         if not _is_ok_for_quantization(node, quant_properties.quant_output, gm):
-            return None
+            return None  # type: ignore[return-value]
 
     return quant_properties
 
 
-def annotate_graph(
+def annotate_graph(  # type: ignore[return]
     gm: torch.fx.GraphModule,
     quantization_config: QuantizationConfig,
     filter_fn: Optional[Callable[[Node], bool]] = None,
@@ -374,4 +374,4 @@ def annotate_graph(
         if quant_properties.quant_output is not None:
             _annotate_output(node, quant_properties.quant_output)
 
-        arm_quantizer_utils.mark_node_as_annotated(node)
+        arm_quantizer_utils.mark_node_as_annotated(node)  # type: ignore[attr-defined]
diff --git a/backends/arm/quantizer/quantization_config.py b/backends/arm/quantizer/quantization_config.py
index b94d9bda640..394995201e4 100644
--- a/backends/arm/quantizer/quantization_config.py
+++ b/backends/arm/quantizer/quantization_config.py
@@ -82,14 +82,14 @@ def _derive_qparams_fn(
             input_act = node.args[0]
             weight = node.args[1]
             quantization_spec = DerivedQuantizationSpec(
-                derived_from=[(input_act, node), (weight, node)],
+                derived_from=[(input_act, node), (weight, node)],  # type: ignore[list-item]
                 derive_qparams_fn=_derive_qparams_fn,
                 dtype=torch.int32,
                 quant_min=torch.iinfo(torch.int32).min,
                 quant_max=torch.iinfo(torch.int32).max - 1,
                 qscheme=torch.per_tensor_symmetric,
             )
-            return quantization_spec
+            return quantization_spec  # type: ignore[return-value]
 
         if self.bias is None:
             return None
diff --git a/backends/arm/test/common.py b/backends/arm/test/common.py
index 7ebf89e3927..2f08fa81918 100644
--- a/backends/arm/test/common.py
+++ b/backends/arm/test/common.py
@@ -41,8 +41,8 @@ def maybe_get_tosa_collate_path() -> str | None:
     if tosa_test_base:
         current_test = os.environ.get("PYTEST_CURRENT_TEST")
         #'backends/arm/test/ops/test_mean_dim.py::TestMeanDim::test_meandim_tosa_BI_0_zeros (call)'
-        test_class = current_test.split("::")[1]
-        test_name = current_test.split("::")[-1].split(" ")[0]
+        test_class = current_test.split("::")[1]  # type: ignore[union-attr]
+        test_name = current_test.split("::")[-1].split(" ")[0]  # type: ignore[union-attr]
         if "BI" in test_name:
             tosa_test_base = os.path.join(tosa_test_base, "tosa-bi")
         elif "MI" in test_name:
@@ -100,7 +100,7 @@ def get_u85_compile_spec(
     """
     Default compile spec for Ethos-U85 tests.
     """
-    return get_u85_compile_spec_unbuilt(
+    return get_u85_compile_spec_unbuilt(  # type: ignore[attr-defined]
         custom_path=custom_path,
     ).build()
 
@@ -144,4 +144,4 @@ def get_u85_compile_spec_unbuilt(
         )
         .dump_intermediate_artifacts_to(artifact_path)
     )
-    return compile_spec
+    return compile_spec  # type: ignore[return-value]
diff --git a/backends/arm/test/misc/test_debug_feats.py b/backends/arm/test/misc/test_debug_feats.py
index a9491418a44..690549d7174 100644
--- a/backends/arm/test/misc/test_debug_feats.py
+++ b/backends/arm/test/misc/test_debug_feats.py
@@ -48,7 +48,7 @@ def _tosa_MI_pipeline(self, module: torch.nn.Module, dump_file=None):
         (
             ArmTester(
                 module,
-                example_inputs=module.get_inputs(),
+                example_inputs=module.get_inputs(),  # type: ignore[operator]
                 compile_spec=common.get_tosa_compile_spec("TOSA-0.80+MI"),
             )
             .export()
@@ -61,7 +61,7 @@ def _tosa_BI_pipeline(self, module: torch.nn.Module, dump_file=None):
         (
             ArmTester(
                 module,
-                example_inputs=module.get_inputs(),
+                example_inputs=module.get_inputs(),  # type: ignore[operator]
                 compile_spec=common.get_tosa_compile_spec("TOSA-0.80+BI"),
             )
             .quantize()
diff --git a/backends/arm/test/misc/test_lifted_tensor.py b/backends/arm/test/misc/test_lifted_tensor.py
index a16b1e639b1..092483fd632 100644
--- a/backends/arm/test/misc/test_lifted_tensor.py
+++ b/backends/arm/test/misc/test_lifted_tensor.py
@@ -1,4 +1,4 @@
-# Copyright 2024 Arm Limited and/or its affiliates.
+# Copyright 2024-2025 Arm Limited and/or its affiliates.
 #
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
@@ -10,7 +10,7 @@
 import torch
 from executorch.backends.arm.test import common
 from executorch.backends.arm.test.tester.arm_tester import ArmTester
-from parameterized import parameterized
+from parameterized import parameterized  # type: ignore[import-untyped]
 
 
 class LiftedTensor(torch.nn.Module):
@@ -23,14 +23,14 @@ class LiftedTensor(torch.nn.Module):
         (operator.sub, (torch.rand(2, 2), 2)),
     ]
 
-    def __init__(self, op: callable):
+    def __init__(self, op: callable):  # type: ignore[valid-type]
         super().__init__()
         self.op = op
         self.lifted_tensor = torch.Tensor([[1, 2], [3, 4]])
 
     def forward(self, x: torch.Tensor, length) -> torch.Tensor:
         sliced = self.lifted_tensor[:, :length]
-        return self.op(sliced, x)
+        return self.op(sliced, x)  # type: ignore[misc]
 
 
 class LiftedScalarTensor(torch.nn.Module):
@@ -42,13 +42,13 @@ class LiftedScalarTensor(torch.nn.Module):
         (operator.sub, (torch.randn(3),), 1.0),
     ]
 
-    def __init__(self, op: callable, arg1: Union[int, float, torch.tensor]):
+    def __init__(self, op: callable, arg1: Union[int, float, torch.tensor]):  # type: ignore[valid-type]
         super().__init__()
         self.op = op
         self.arg1 = arg1
 
     def forward(self, x: torch.Tensor) -> torch.Tensor:
-        return self.op(x, self.arg1)
+        return self.op(x, self.arg1)  # type: ignore[misc]
 
 
 class TestLiftedTensor(unittest.TestCase):
diff --git a/backends/arm/test/misc/test_tosa_spec.py b/backends/arm/test/misc/test_tosa_spec.py
index 77b10cf3151..d61b3fe718b 100644
--- a/backends/arm/test/misc/test_tosa_spec.py
+++ b/backends/arm/test/misc/test_tosa_spec.py
@@ -1,4 +1,4 @@
-# Copyright 2024 Arm Limited and/or its affiliates.
+# Copyright 2024-2025 Arm Limited and/or its affiliates.
 # All rights reserved.
 #
 # This source code is licensed under the BSD-style license found in the
@@ -13,7 +13,7 @@
 )
 
 from executorch.exir.backend.compile_spec_schema import CompileSpec
-from parameterized import parameterized
+from parameterized import parameterized  # type: ignore[import-untyped]
 
 test_valid_0_80_strings = [
     "TOSA-0.80+BI",
@@ -64,13 +64,13 @@
 class TestTosaSpecification(unittest.TestCase):
     """Tests the TOSA specification class"""
 
-    @parameterized.expand(test_valid_0_80_strings)
+    @parameterized.expand(test_valid_0_80_strings)  # type: ignore[misc]
     def test_version_string_0_80(self, version_string: str):
         tosa_spec = TosaSpecification.create_from_string(version_string)
         assert isinstance(tosa_spec, Tosa_0_80)
         assert tosa_spec.profile in ["BI", "MI"]
 
-    @parameterized.expand(test_valid_1_00_strings)
+    @parameterized.expand(test_valid_1_00_strings)  # type: ignore[misc]
     def test_version_string_1_00(self, version_string: str):
         tosa_spec = TosaSpecification.create_from_string(version_string)
         assert isinstance(tosa_spec, Tosa_1_00)
@@ -83,7 +83,7 @@ def test_version_string_1_00(self, version_string: str):
                 e in test_valid_1_00_extensions[profile] for e in tosa_spec.extensions
             ]
 
-    @parameterized.expand(test_invalid_strings)
+    @parameterized.expand(test_invalid_strings)  # type: ignore[misc]
     def test_invalid_version_strings(self, version_string: str):
         tosa_spec = None
         with self.assertRaises(ValueError):
@@ -91,12 +91,12 @@ def test_invalid_version_strings(self, version_string: str):
 
         assert tosa_spec is None
 
-    @parameterized.expand(test_compile_specs)
+    @parameterized.expand(test_compile_specs)  # type: ignore[misc]
     def test_create_from_compilespec(self, compile_specs: list[CompileSpec]):
         tosa_spec = TosaSpecification.create_from_compilespecs(compile_specs)
         assert isinstance(tosa_spec, TosaSpecification)
 
-    @parameterized.expand(test_compile_specs_no_version)
+    @parameterized.expand(test_compile_specs_no_version)  # type: ignore[misc]
     def test_create_from_invalid_compilespec(self, compile_specs: list[CompileSpec]):
         tosa_spec = None
         with self.assertRaises(ValueError):
diff --git a/backends/arm/test/models/test_mobilenet_v2_arm.py b/backends/arm/test/models/test_mobilenet_v2_arm.py
index 21bd43202d6..62b14a1022e 100644
--- a/backends/arm/test/models/test_mobilenet_v2_arm.py
+++ b/backends/arm/test/models/test_mobilenet_v2_arm.py
@@ -14,8 +14,10 @@
 from executorch.backends.arm.test import common, conftest
 
 from executorch.backends.arm.test.tester.arm_tester import ArmTester
-from torchvision import models, transforms
-from torchvision.models.mobilenetv2 import MobileNet_V2_Weights
+from torchvision import models, transforms  # type: ignore[import-untyped]
+from torchvision.models.mobilenetv2 import (  # type: ignore[import-untyped]
+    MobileNet_V2_Weights,
+)
 
 
 logger = logging.getLogger(__name__)
diff --git a/backends/arm/test/ops/test_add.py b/backends/arm/test/ops/test_add.py
index db6fde53ae9..5d9269f1d4d 100644
--- a/backends/arm/test/ops/test_add.py
+++ b/backends/arm/test/ops/test_add.py
@@ -14,7 +14,7 @@
 from executorch.backends.arm.test import common, conftest
 from executorch.backends.arm.test.tester.arm_tester import ArmTester
 from executorch.exir.backend.compile_spec_schema import CompileSpec
-from parameterized import parameterized
+from parameterized import parameterized  # type: ignore[import-untyped]
 
 
 class TestSimpleAdd(unittest.TestCase):
diff --git a/backends/arm/test/tester/arm_tester.py b/backends/arm/test/tester/arm_tester.py
index 639cea5bae9..a5e7267b372 100644
--- a/backends/arm/test/tester/arm_tester.py
+++ b/backends/arm/test/tester/arm_tester.py
@@ -12,7 +12,7 @@
 
 import executorch.backends.xnnpack.test.tester.tester as tester
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore[import-untyped]
 
 import torch.fx
 import torch.utils._pytree as pytree
diff --git a/backends/arm/tosa_mapping.py b/backends/arm/tosa_mapping.py
index ec57bd5ce22..75d82f2a4b6 100644
--- a/backends/arm/tosa_mapping.py
+++ b/backends/arm/tosa_mapping.py
@@ -1,4 +1,4 @@
-# Copyright 2023-2024 Arm Limited and/or its affiliates.
+# Copyright 2023-2025 Arm Limited and/or its affiliates.
 #
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
@@ -11,7 +11,7 @@
 # the standardised TOSA representation.
 #
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 import torch
 
 
diff --git a/backends/arm/tosa_quant_utils.py b/backends/arm/tosa_quant_utils.py
index 9869a08c0ba..d53362cb363 100644
--- a/backends/arm/tosa_quant_utils.py
+++ b/backends/arm/tosa_quant_utils.py
@@ -10,9 +10,9 @@
 import math
 from typing import cast, NamedTuple
 
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 import torch.fx
-import tosa.Op as TosaOp
+import tosa.Op as TosaOp  # type: ignore
 from executorch.backends.arm.tosa_mapping import TosaArg
 from executorch.exir.dialects._ops import ops as exir_ops
 from serializer.tosa_serializer import TosaSerializerTensor
diff --git a/backends/arm/tosa_utils.py b/backends/arm/tosa_utils.py
index 9fefdbb3ff3..a57e8aa10c9 100644
--- a/backends/arm/tosa_utils.py
+++ b/backends/arm/tosa_utils.py
@@ -10,7 +10,7 @@
 from typing import Any
 
 import numpy as np
-import serializer.tosa_serializer as ts
+import serializer.tosa_serializer as ts  # type: ignore
 import torch
 from executorch.backends.arm.tosa_mapping import TosaArg
 
diff --git a/backends/arm/util/arm_model_evaluator.py b/backends/arm/util/arm_model_evaluator.py
index f8aeab25ba1..b43c781dfdf 100644
--- a/backends/arm/util/arm_model_evaluator.py
+++ b/backends/arm/util/arm_model_evaluator.py
@@ -1,4 +1,4 @@
-# Copyright 2024 Arm Limited and/or its affiliates.
+# Copyright 2024-2025 Arm Limited and/or its affiliates.
 # All rights reserved.
 #
 # This source code is licensed under the BSD-style license found in the
@@ -17,7 +17,7 @@
 import torch
 from torch.nn.modules import Module
 from torch.utils.data import DataLoader
-from torchvision import datasets, transforms
+from torchvision import datasets, transforms  # type: ignore[import-untyped]
 
 
 # Logger for outputting progress for longer running evaluation
@@ -59,7 +59,7 @@ def __init__(
         if tosa_output_path:
             self.tosa_output_path = tosa_output_path
         else:
-            self.tosa_output_path = None
+            self.tosa_output_path = None  # type: ignore[assignment]
 
     def get_model_error(self) -> defaultdict:
         """
@@ -104,7 +104,7 @@ def get_compression_ratio(self) -> float:
 
         return compression_ratio
 
-    def evaluate(self) -> dict[Any]:
+    def evaluate(self) -> dict[Any]:  # type: ignore[type-arg]
         model_error_dict = self.get_model_error()
 
         output_metrics = {"name": self.model_name, "metrics": dict(model_error_dict)}
@@ -112,7 +112,7 @@ def evaluate(self) -> dict[Any]:
         if self.tosa_output_path:
             # We know output_metrics["metrics"] is list since we just defined it, safe to ignore.
             # pyre-ignore[16]
-            output_metrics["metrics"][
+            output_metrics["metrics"][  # type: ignore[index]
                 "compression_ratio"
             ] = self.get_compression_ratio()