1 | /* Copyright 2015-2017 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 | |
16 | #ifndef TENSORFLOW_CORE_KERNELS_IDENTITY_N_OP_H_ |
17 | #define TENSORFLOW_CORE_KERNELS_IDENTITY_N_OP_H_ |
18 | |
19 | #include "tensorflow/core/framework/metrics.h" |
20 | #include "tensorflow/core/framework/node_def_util.h" |
21 | #include "tensorflow/core/framework/op_kernel.h" |
22 | |
23 | namespace tensorflow { |
24 | |
25 | class IdentityNOp : public OpKernel { |
26 | public: |
27 | explicit IdentityNOp(OpKernelConstruction* context) : OpKernel(context) {} |
28 | |
29 | void Compute(OpKernelContext* context) override { |
30 | OpInputList input; |
31 | OpOutputList output; |
32 | OP_REQUIRES_OK(context, context->input_list("input" , &input)); |
33 | OP_REQUIRES_OK(context, context->output_list("output" , &output)); |
34 | OP_REQUIRES(context, input.size() == output.size(), |
35 | errors::InvalidArgument("Input and output counts must match" )); |
36 | if (absl::StrContains(name(), kTpuExecuteStagingNodeName)) { |
37 | // TPU staging node execution is used for measuring launch latency. |
38 | metrics::UpdateTpuVariableDistributionTime(EnvTime::NowMicros() - |
39 | context->start_time_usecs()); |
40 | } |
41 | for (int i = 0; i < input.size(); ++i) { |
42 | output.set(i, input[i]); |
43 | } |
44 | } |
45 | |
46 | bool IsExpensive() override { return false; } |
47 | }; |
48 | |
49 | } // namespace tensorflow |
50 | |
51 | #endif // TENSORFLOW_CORE_KERNELS_IDENTITY_N_OP_H_ |
52 | |