Cherry-pick ONNX export update into release 1.0 (#936)

* Bump up version id

* Fix for ONNX export for quantized BERT models (#935)

* Remove quantization of identity branch on BERT models

* Style and quality fixes.

* Update src/sparseml/pytorch/sparsification/quantization/quantize_qat_export.py

Co-authored-by: Benjamin Fineran <[email protected]>

* Removed unused function

Co-authored-by: Benjamin Fineran <[email protected]>

Co-authored-by: Benjamin Fineran <[email protected]>

Author: anmarques

src/sparseml/onnx/utils/graph_optimizer.py

@@ -40,7 +40,6 @@
 __all__ = [
     "fold_conv_bns",
     "quantize_resnet_identity_add_inputs",
-    "quantized_residual_add_optim",
 ]
 
 
@@ -202,91 +201,6 @@ def quantize_resnet_identity_add_inputs(quantized_model: onnx.ModelProto) -> boo
     return optimization_made
 
 
-def quantized_residual_add_optim(quantized_model: onnx.ModelProto) -> bool:
-    """
-    This optimization adds a quant/dequant block to the identity branch of a
-    residual whose non-identity branch is quantized. This enables the add at the
-    end of the residual to be fused at runtime.
-
-    Function will match to any node who has two children nodes - one add node
-    and one quantize node whose branch eventually leads to the other add node.
-
-    :param quantized_model: A loaded quantized model to perform this optimization on
-    :return: True if an in-place optimization was made
-    """
-    graph = ONNXGraph(quantized_model)
-    optimization_made = False
-    for node in quantized_model.graph.node:
-        children_nodes = graph.get_node_children(node)
-        if len(children_nodes) != 2:
-            continue
-
-        add_node = [node for node in children_nodes if node.op_type == "Add"]
-        quant_node = [
-            node for node in children_nodes if node.op_type == "QuantizeLinear"
-        ]
-        if not add_node or not quant_node:
-            continue
-        add_node = add_node[0]
-        quant_node = quant_node[0]
-
-        # verify that quant_node eventually leads to add_node
-        curr_node = [quant_node]
-        iter = 0
-        max_iter = 20  # avoid cycles
-        while curr_node and curr_node[0] != add_node and iter < max_iter:
-            curr_node = graph.get_node_children(curr_node[0])
-            iter += 1
-        if curr_node[0] != add_node:
-            continue
-
-        # create de-quantize node for identity
-        dequant_node = _make_dequant_node_for_quant(quant_node)
-
-        # update graph
-        identity_edge_idx = 0 if add_node.input[0] == node.output[0] else 1
-        graph.add_node(dequant_node)
-        graph.update_node_input(add_node, dequant_node.output[0], identity_edge_idx)
-        optimization_made = True
-
-        # if any of the add children have are a quantize op while others aren't
-        # add a quant/dequant block to the non quantized paths to allow for fusion
-        # of the add
-        add_node_children = graph.get_node_children(add_node)
-        add_node_quant_child_idx = [
-            idx
-            for idx, node in enumerate(add_node_children)
-            if node.op_type == "QuantizeLinear"
-        ]
-        if not add_node_quant_child_idx or all(
-            n.op_type == "Add" or n.op_type == "QuantizeLinear"
-            for n in add_node_children
-        ):
-            # no quant child node, or all child nodes are quant/add nodes
-            continue
-
-        # make dequant pair node for quant child and add to graph
-        add_node_dequant_child = _make_dequant_node_for_quant(
-            add_node_children[add_node_quant_child_idx[0]]
-        )
-        graph.add_node(add_node_dequant_child)
-
-        # update all non quant node children to take the quant/dequant block as input
-        for add_child_node in add_node_children:
-            if add_child_node.op_type == "QuantizeLinear":
-                continue
-            add_node_id_idx = [
-                idx
-                for idx, output_id in enumerate(add_child_node.input)
-                if output_id == add_node.output[0]
-            ][0]
-            graph.update_node_input(
-                add_child_node, add_node_dequant_child.output[0], add_node_id_idx
-            )
-
-    return optimization_made
-
-
 def _make_dequant_node_for_quant(quant_node: onnx.NodeProto) -> onnx.NodeProto:
     return onnx.helper.make_node(
         "DequantizeLinear",

src/sparseml/pytorch/sparsification/quantization/quantize_qat_export.py

@@ -25,6 +25,7 @@
 
 import numpy
 import onnx
+import torch
 from onnx import ModelProto, NodeProto, numpy_helper
 
 from sparseml.onnx.utils import (
@@ -34,7 +35,6 @@
     get_node_attributes,
     get_node_output_nodes,
     quantize_resnet_identity_add_inputs,
-    quantized_residual_add_optim,
     remove_node_and_params_from_graph,
     swap_node_output,
     update_model_param,
@@ -323,9 +323,21 @@ def _attribute_to_kwarg(attribute: onnx.AttributeProto):
 def _quantize_array(
     array: numpy.ndarray, scale: float, zero_point: int, dtype: Any = numpy.uint8
 ) -> numpy.ndarray:
-    dmin = numpy.iinfo(dtype).min
-    dmax = numpy.iinfo(dtype).max
-    return ((array / scale).round() + zero_point).clip(dmin, dmax).astype(dtype)
+    if dtype == numpy.uint8:
+        tensor_dtype = torch.quint8
+    elif dtype == numpy.int8:
+        tensor_dtype = torch.qint8
+    elif dtype == numpy.int32:
+        tensor_dtype = torch.qint32
+
+    tensor = torch.Tensor(array).to(torch.float32)
+    if isinstance(scale, numpy.ndarray):
+        scale = scale.item()
+    if isinstance(zero_point, numpy.ndarray):
+        zero_point = zero_point.item()
+
+    quant_tensor = torch.quantize_per_tensor(tensor, scale, zero_point, tensor_dtype)
+    return quant_tensor.int_repr().numpy()
 
 
 def _convert_quantizable_conv(
@@ -450,6 +462,7 @@ def _convert_quantizable_gemm(
         weight_quantize_params.target,
         weight_quantize_params.scale,
         weight_quantize_params.zero_point,
+        weight_quantize_params.zero_point.dtype,
     )
     quantized_weight = quantized_weight.transpose()  # Gemm has implicit transpose
     quantized_weight_name = "{}.weight_quantized".format(gemm_node.name)
@@ -732,6 +745,7 @@ def _add_quantized_conv_matmul_add_ops(
         weight_quantize_params.target,
         weight_quantize_params.scale,
         weight_quantize_params.zero_point,
+        weight_quantize_params.zero_point.dtype,
     )
     if transpose_weight:
         quantized_weight = quantized_weight.transpose()
@@ -1404,7 +1418,9 @@ def _quantize_qat_embedding(model: ModelProto):
         embedding = numpy_helper.to_array(embedding_initializer)
         scale = numpy_helper.to_array(scale_initializer)
         zero_point = numpy_helper.to_array(zp_initializer)
-        embedding_quant = _quantize_array(embedding, scale, zero_point)
+        embedding_quant = _quantize_array(
+            embedding, scale, zero_point, zero_point.dtype
+        )
         embedding_quant_initializer = numpy_helper.from_array(
             embedding_quant, name=f"{embedding_initializer.name}_quant"
         )
@@ -1569,7 +1585,6 @@ def quantize_torch_qat_export(
     _convert_quantizable_gemm_no_activations(model)
     _quantize_qat_embedding(model)
     quantize_resnet_identity_add_inputs(model)
-    quantized_residual_add_optim(model)
     _remove_duplicate_quantize_ops(model)
     _cleanup_unused_quants(model)
 

src/sparseml/version.py

@@ -19,7 +19,7 @@
 from datetime import date
 
 
-version_base = "1.0.0"
+version_base = "1.0.1"
 is_release = False  # change to True to set the generated version as a release version