Support weight sharing in PTE (#13941)

### Summary
1. Support weight sharing with compile spec
2. Support weight sharing feature to llama export script and runner
3. Optimize llama performance

Author: neuropilot-captain

backends/mediatek/preprocess.py

@@ -4,14 +4,16 @@
 # except in compliance with the License. See the license file in the root
 # directory of this source tree for more details.
 
+import collections
 import contextlib
 import struct
 
-from typing import final, List
+from typing import Dict, final, List
 
 import mtk_converter
 import mtk_neuron
 import torch
+from executorch.exir._serialize._named_data_store import NamedDataStore
 from executorch.exir.backend.backend_details import (
     BackendDetails,
     ExportedProgram,
@@ -20,6 +22,9 @@
 from executorch.exir.backend.compile_spec_schema import CompileSpec
 
 SKIP_COMPILE_SPEC_KEYS = {"ImportForever"}
+EXTRACT_SHARED_BLOB_KEY = "ExtractSharedBlobKey"
+HEADER_SIZE = 13
+HEADER_VERSION = 1
 REQUIRED_COMPILE_SPEC_KEYS = {"platform-config"}
 SUPPORTED_PLATFORM_CONFIGS = {"mt6989", "mt6991"}
 
@@ -41,6 +46,21 @@ def assert_default_dim_order(edge_graph_module: torch.fx.GraphModule) -> None:
                 )
 
 
+def _pack_header(num_inputs, num_outputs, model_bytes_size):
+    header_bytes = struct.pack(
+        "<BIII", HEADER_VERSION, num_inputs, num_outputs, model_bytes_size
+    )
+    assert len(header_bytes) == HEADER_SIZE
+    return header_bytes
+
+
+def _unpack_header(header_bytes):
+    assert len(header_bytes) == HEADER_SIZE
+    version, num_inputs, num_outputs, buffer_size = struct.unpack("<BIII", header_bytes)
+    assert version == HEADER_VERSION
+    return num_inputs, num_outputs, buffer_size
+
+
 @final
 class NeuropilotBackend(BackendDetails):
 
@@ -90,8 +110,14 @@ def preprocess(
 
         compile_options = ["--relax-fp32", "--opt=3"]
         for spec in module_compile_spec:
+            # Special compile spec handling
             if spec.key in SKIP_COMPILE_SPEC_KEYS:
                 continue
+            if spec.key == EXTRACT_SHARED_BLOB_KEY:
+                compile_options.append("--dla-opt=0")
+                continue
+
+            # General compile spec handling
             if spec.value == b"":
                 compile_options.append(f"--{spec.key}")
             else:
@@ -112,5 +138,77 @@ def preprocess(
 
         num_inputs = len(input_names)
         num_outputs = len(output_names)
-        header = struct.pack("<BIII", 1, num_inputs, num_outputs, len(model_bytes))
-        return PreprocessResult(processed_bytes=bytes(header + model_bytes))
+        header_bytes = _pack_header(num_inputs, num_outputs, len(model_bytes))
+        return PreprocessResult(processed_bytes=bytes(header_bytes + model_bytes))
+
+    @classmethod
+    def preprocess_multimethod(
+        cls,
+        edge_programs: Dict[str, List[ExportedProgram]],
+        compile_specs: Dict[str, List[List[CompileSpec]]],
+    ) -> Dict[str, list[PreprocessResult]]:
+
+        # Follow the default behavior of `preprocess_multimethod`
+        preprocess_results = {}
+        for method_name, programs in edge_programs.items():
+            assert (
+                method_name in compile_specs
+            ), f"Error: missing compile specs for {method_name}"
+            compile_specs_for_method = compile_specs[method_name]
+            assert len(compile_specs_for_method) == len(
+                programs
+            ), f"Error: method {method_name} has {len(programs)} partitions but only {len(compile_specs_for_method)}"
+            results_for_method = []
+            for program, compile_spec_for_program in zip(
+                programs, compile_specs_for_method
+            ):
+                preprocess_result = cls.preprocess(program, compile_spec_for_program)
+                results_for_method.append(preprocess_result)
+
+            preprocess_results[method_name] = results_for_method
+
+        # Try extract shared data blob if necessary
+        infos_dict = collections.defaultdict(list)
+        models_dict = collections.defaultdict(list)
+        result_dict = collections.defaultdict(list)
+        for method_name, method_results in preprocess_results.items():
+            for idx, result in enumerate(method_results):
+                shared_blob_key = None
+                for spec in compile_specs[method_name][idx]:
+                    if spec.key == EXTRACT_SHARED_BLOB_KEY:
+                        shared_blob_key = spec.value.decode("utf-8")
+
+                if shared_blob_key is None:
+                    continue
+
+                header_bytes = result.processed_bytes[:HEADER_SIZE]
+                model_bytes = result.processed_bytes[HEADER_SIZE:]
+                num_inputs, num_outputs, model_bytes_size = _unpack_header(header_bytes)
+                assert len(model_bytes) == model_bytes_size
+                infos_dict[shared_blob_key].append((num_inputs, num_outputs))
+                models_dict[shared_blob_key].append(model_bytes)
+                result_dict[shared_blob_key].append(result)
+
+        data_store_output_dict = {}
+        for key, models in models_dict.items():
+            ndm = NamedDataStore()
+            blob, new_models = mtk_neuron.extract_shared_data(
+                models, options="-e union"
+            )
+            ndm.add_named_data(key, bytes(blob))
+            data_store_output_dict[key] = ndm.get_named_data_store_output()
+            models.clear()
+            models.extend(new_models)
+
+        for key, data_store_output in data_store_output_dict.items():
+            for idx, (model_info, model_bytes) in enumerate(
+                zip(infos_dict[key], models_dict[key])
+            ):
+                num_inputs, num_outputs = model_info
+                header_bytes = _pack_header(num_inputs, num_outputs, len(model_bytes))
+                result_dict[key][idx].data_store_output = data_store_output
+                result_dict[key][idx].processed_bytes = bytes(
+                    header_bytes + model_bytes
+                )
+
+        return preprocess_results

backends/mediatek/runtime/NeuronBackend.cpp

@@ -12,8 +12,8 @@
 #include "NeuronPayloadHeader.h"
 #include "api/NeuronAdapter.h"
 
+#include <executorch/runtime/executor/pte_data_map.h>
 #include "executorch/runtime/core/error.h"
-#include "executorch/runtime/core/exec_aten/util/dim_order_util.h"
 
 #include <algorithm>
 #include <memory>
@@ -24,6 +24,7 @@ namespace executorch {
 namespace backends {
 namespace neuron {
 
+using executorch::ET_RUNTIME_NAMESPACE::NamedDataMap;
 using executorch::runtime::ArrayRef;
 using executorch::runtime::BackendExecutionContext;
 using executorch::runtime::BackendInitContext;
@@ -38,12 +39,22 @@ using executorch::runtime::Span;
 
 const char kHighAddrKey[] = "HighAddr";
 const char kImportForeverKey[] = "ImportForever";
+const char kSharedWeightsKey[] = "ExtractSharedBlobKey";
 
 Result<DelegateHandle*> NeuronBackend::init(
     BackendInitContext& context,
     FreeableBuffer* processed,
     ArrayRef<CompileSpec> compile_specs) const {
   NeuronDelegateSetting setting;
+  MemoryAllocator* runtime_allocator = context.get_runtime_allocator();
+  NeuronExecuTorchDelegate* delegate =
+      runtime_allocator->allocateInstance<NeuronExecuTorchDelegate>();
+  if (delegate == nullptr) {
+    return Error::MemoryAllocationFailed;
+  }
+
+  new (delegate) NeuronExecuTorchDelegate();
+
   for (auto& compile_spec : compile_specs) {
     if (std::strcmp(compile_spec.key, kHighAddrKey) == 0) {
       setting.mHighAddr = *static_cast<char*>(compile_spec.value.buffer);
@@ -54,11 +65,62 @@ Result<DelegateHandle*> NeuronBackend::init(
           "NeuronBackend",
           "IsImportForever Enable : %d",
           setting.mImportForever);
+    } else if (std::strcmp(compile_spec.key, kSharedWeightsKey) == 0) {
+      setting.mSharedWeights = true;
+      std::string shared_weights_key(
+          static_cast<char*>(compile_spec.value.buffer),
+          compile_spec.value.nbytes);
+      LogInfo(
+          "NeuronBackend",
+          "SharedWeights Enabled for %s",
+          shared_weights_key.c_str());
+      std::shared_ptr<NeuronSharedWeights> neuron_shared_weights;
+      if (neuron_shared_weights_cache_.find(shared_weights_key) !=
+          neuron_shared_weights_cache_.end()) {
+        neuron_shared_weights =
+            neuron_shared_weights_cache_.at(shared_weights_key).lock();
+        if (neuron_shared_weights) {
+          LogInfo(
+              "NeuronBackend",
+              "Reusing cached shared weights with key %s",
+              shared_weights_key.c_str());
+          delegate->SetSharedWeights(neuron_shared_weights);
+          continue;
+        } else {
+          LogInfo(
+              "NeuronBackend",
+              "Shared weights cache expired: %s",
+              shared_weights_key.c_str());
+          neuron_shared_weights_cache_.erase(shared_weights_key); // Expired
+        }
+      }
+      const NamedDataMap* named_data_map = context.get_named_data_map();
+      Result<FreeableBuffer> shared_weights =
+          named_data_map->get_data(shared_weights_key.c_str());
+
+      if (shared_weights.ok()) {
+        LogInfo(
+            "NeuronBackend",
+            "Loaded shared weights from named_data_map. Size: %zu",
+            shared_weights.get().size());
+        FreeableBuffer& buffer = shared_weights.get();
+        neuron_shared_weights =
+            std::make_shared<NeuronSharedWeights>(std::move(buffer));
+        delegate->SetSharedWeights(neuron_shared_weights);
+        neuron_shared_weights_cache_[shared_weights_key] =
+            neuron_shared_weights;
+      } else {
+        LogError(
+            "NeuronBackend",
+            "Failed to load shared weights from named_data_map.");
+        return Error::Internal;
+      }
     } else {
       LogWarn("NeuronBackend", "unknown compile spec: %s", compile_spec.key);
     }
   }
   auto Payload = NeuronPayload(processed->data(), processed->size());
+
   LogInfo(
       "NeuronBackend",
       "version %u, input %u, output %u, length %u, payload size: %zu",
@@ -68,19 +130,7 @@ Result<DelegateHandle*> NeuronBackend::init(
       Payload.Header.DataLen,
       processed->size());
 
-  MemoryAllocator* runtime_allocator = context.get_runtime_allocator();
-  NeuronExecuTorchDelegate* delegate =
-      runtime_allocator->allocateInstance<NeuronExecuTorchDelegate>();
-  if (delegate == nullptr) {
-    return Error::MemoryAllocationFailed;
-  }
-
-  new (delegate) NeuronExecuTorchDelegate();
-
-  if (delegate == nullptr) {
-    return nullptr;
-  }
-  auto res = delegate->LoadCompiledNetwork(Payload, setting);
+  int res = delegate->LoadCompiledNetwork(Payload, setting);
   return res == NEURON_NO_ERROR ? delegate : nullptr;
 }
 
@@ -112,21 +162,22 @@ Error NeuronExecuTorchDelegate::execute(
     return Error::InvalidState;
   };
 
+  ET_CHECK_OR_RETURN_ERROR(
+      CheckDimOrder(args) == NEURON_NO_ERROR,
+      Internal,
+      "Expecting default dim_order but got a non default dim_order tensor input");
+
+  PrepareInputsOuputs(args);
+
   auto allocator =
       dynamic_cast<neuron::BufferAllocator*>(context.get_temp_allocator());
-  size_t inputCount = mInputSizes.size(), outputCount = mOutputSizes.size();
-
-  for (int i = 0; i < inputCount; i++) {
-    auto tensor_in = args[i]->toTensor();
-    ET_CHECK_OR_RETURN_ERROR(
-        runtime::is_contiguous_dim_order(
-            tensor_in.dim_order().data(), tensor_in.dim()),
-        Internal,
-        "Expecting default dim_order but got a non default dim_order tensor for external input %u",
-        i);
-
-    auto data_ptr = args[i]->toTensor().data_ptr();
-    auto data_size = args[i]->toTensor().nbytes();
+
+  size_t inputCount = mInputSizes.size() + neuron_shared_weights_.size();
+  size_t outputCount = mOutputSizes.size();
+
+  for (size_t i = 0; i < inputCount; i++) {
+    auto data_ptr = mPreparedInputs[i].data_ptr;
+    auto data_size = mPreparedInputs[i].size;
     if (IsCached</*isInput=*/true>(i, data_ptr)) {
       continue;
     };
@@ -141,22 +192,20 @@ Error NeuronExecuTorchDelegate::execute(
     }
   }
 
-  for (int o = inputCount; o < inputCount + outputCount; o++) {
-    auto data_ptr = args[o]->toTensor().data_ptr();
-    auto data_size = args[o]->toTensor().nbytes();
-    auto output_index = o - inputCount;
-    if (IsCached</*isInput=*/false>(output_index, data_ptr)) {
+  for (size_t o = 0; o < outputCount; o++) {
+    auto data_ptr = mPreparedOutputs[o].data_ptr;
+    auto data_size = mPreparedOutputs[o].size;
+    if (IsCached</*isInput=*/false>(o, data_ptr)) {
       continue;
     };
     auto unit = allocator != nullptr ? allocator->Find(data_ptr) : nullptr;
     if (unit) {
-      UpdateCache</*isInput=*/false>(output_index, data_ptr);
+      UpdateCache</*isInput=*/false>(o, data_ptr);
       size_t offset = (char*)data_ptr - (char*)unit->GetAddress();
       mExecutor.SetInputOutputFromMemory</*isInput*/ false>(
-          output_index, unit->GetNeuronMemory(), offset, data_size);
+          o, unit->GetNeuronMemory(), offset, data_size);
     } else {
-      mExecutor.SetInputOutput</*isInput=*/false>(
-          output_index, data_ptr, data_size);
+      mExecutor.SetInputOutput</*isInput=*/false>(o, data_ptr, data_size);
     }
   }