1 /* Copyright 2020 The TensorFlow Authors. All Rights Reserved.
2
3 Licensed under the Apache License, Version 2.0 (the "License");
4 you may not use this file except in compliance with the License.
5 You may obtain a copy of the License at
6
7 http://www.apache.org/licenses/LICENSE-2.0
8
9 Unless required by applicable law or agreed to in writing, software
10 distributed under the License is distributed on an "AS IS" BASIS,
11 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 See the License for the specific language governing permissions and
13 limitations under the License.
14 ==============================================================================*/
15 #include "tensorflow/lite/delegates/utils/simple_delegate.h"
16
17 #include <limits>
18 #include <memory>
19 #include <string>
20 #include <vector>
21
22 #include "tensorflow/lite/builtin_ops.h"
23 #include "tensorflow/lite/c/common.h"
24 #include "tensorflow/lite/context_util.h"
25 #include "tensorflow/lite/delegates/utils.h"
26 #include "tensorflow/lite/kernels/internal/compatibility.h"
27 #include "tensorflow/lite/minimal_logging.h"
28
29 namespace tflite {
30 namespace {
GetDelegateKernelRegistration(SimpleDelegateInterface * delegate)31 TfLiteRegistration GetDelegateKernelRegistration(
32 SimpleDelegateInterface* delegate) {
33 TfLiteRegistration kernel_registration{};
34 kernel_registration.profiling_string = nullptr;
35 kernel_registration.builtin_code = kTfLiteBuiltinDelegate;
36 kernel_registration.custom_name = delegate->Name();
37 kernel_registration.version = 1;
38 kernel_registration.free = [](TfLiteContext* context, void* buffer) -> void {
39 delete reinterpret_cast<SimpleDelegateKernelInterface*>(buffer);
40 };
41 kernel_registration.init = [](TfLiteContext* context, const char* buffer,
42 size_t length) -> void* {
43 const TfLiteDelegateParams* params =
44 reinterpret_cast<const TfLiteDelegateParams*>(buffer);
45 if (params == nullptr) {
46 TF_LITE_KERNEL_LOG(context, "NULL TfLiteDelegateParams passed.");
47 return nullptr;
48 }
49 auto* delegate =
50 reinterpret_cast<SimpleDelegateInterface*>(params->delegate->data_);
51 std::unique_ptr<SimpleDelegateKernelInterface> delegate_kernel(
52 delegate->CreateDelegateKernelInterface());
53 if (delegate_kernel->Init(context, params) != kTfLiteOk) {
54 return nullptr;
55 }
56 return delegate_kernel.release();
57 };
58 kernel_registration.prepare = [](TfLiteContext* context,
59 TfLiteNode* node) -> TfLiteStatus {
60 if (node->user_data == nullptr) {
61 TF_LITE_KERNEL_LOG(context, "Delegate kernel was not initialized");
62 return kTfLiteError;
63 }
64 SimpleDelegateKernelInterface* delegate_kernel =
65 reinterpret_cast<SimpleDelegateKernelInterface*>(node->user_data);
66 return delegate_kernel->Prepare(context, node);
67 };
68 kernel_registration.invoke = [](TfLiteContext* context,
69 TfLiteNode* node) -> TfLiteStatus {
70 SimpleDelegateKernelInterface* delegate_kernel =
71 reinterpret_cast<SimpleDelegateKernelInterface*>(node->user_data);
72 TFLITE_DCHECK(delegate_kernel != nullptr);
73 return delegate_kernel->Eval(context, node);
74 };
75
76 return kernel_registration;
77 }
78
DelegatePrepare(TfLiteContext * context,TfLiteDelegate * base_delegate)79 TfLiteStatus DelegatePrepare(TfLiteContext* context,
80 TfLiteDelegate* base_delegate) {
81 auto* delegate =
82 reinterpret_cast<SimpleDelegateInterface*>(base_delegate->data_);
83 auto delegate_options = delegate->DelegateOptions();
84 if (delegate_options.max_delegated_partitions <= 0)
85 delegate_options.max_delegated_partitions = std::numeric_limits<int>::max();
86
87 TF_LITE_ENSURE_STATUS(delegate->Initialize(context));
88 delegates::IsNodeSupportedFn node_supported_fn =
89 [=](TfLiteContext* context, TfLiteNode* node,
90 TfLiteRegistration* registration,
91 std::string* unsupported_details) -> bool {
92 return delegate->IsNodeSupportedByDelegate(registration, node, context);
93 };
94 // TODO(b/149484598): Update to have method that gets all supported nodes.
95 delegates::GraphPartitionHelper helper(context, node_supported_fn);
96 TF_LITE_ENSURE_STATUS(helper.Partition(nullptr));
97
98 std::vector<int> supported_nodes = helper.GetNodesOfFirstNLargestPartitions(
99 delegate_options.max_delegated_partitions,
100 delegate_options.min_nodes_per_partition);
101
102 TFLITE_LOG_PROD_ONCE(tflite::TFLITE_LOG_INFO,
103 "%s delegate: %d nodes delegated out of %d nodes with "
104 "%d partitions.\n",
105 delegate->Name(), supported_nodes.size(),
106 helper.num_total_nodes(), helper.num_partitions());
107 TfLiteRegistration delegate_kernel_registration =
108 GetDelegateKernelRegistration(delegate);
109
110 return context->ReplaceNodeSubsetsWithDelegateKernels(
111 context, delegate_kernel_registration,
112 BuildTfLiteIntArray(supported_nodes).get(), base_delegate);
113 }
114 } // namespace
115
CreateSimpleDelegate(std::unique_ptr<SimpleDelegateInterface> simple_delegate,int64_t flag)116 TfLiteDelegate* TfLiteDelegateFactory::CreateSimpleDelegate(
117 std::unique_ptr<SimpleDelegateInterface> simple_delegate, int64_t flag) {
118 if (simple_delegate == nullptr) {
119 return nullptr;
120 }
121 auto delegate = new TfLiteDelegate();
122 delegate->Prepare = &DelegatePrepare;
123 delegate->flags = flag;
124 delegate->CopyFromBufferHandle = nullptr;
125 delegate->CopyToBufferHandle = nullptr;
126 delegate->FreeBufferHandle = nullptr;
127 delegate->data_ = simple_delegate.release();
128 return delegate;
129 }
130
DeleteSimpleDelegate(TfLiteDelegate * delegate)131 void TfLiteDelegateFactory::DeleteSimpleDelegate(TfLiteDelegate* delegate) {
132 if (!delegate) return;
133 SimpleDelegateInterface* simple_delegate =
134 reinterpret_cast<SimpleDelegateInterface*>(delegate->data_);
135 delete simple_delegate;
136 delete delegate;
137 }
138 } // namespace tflite
139