1 /* Copyright 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 #include "tensorflow/core/common_runtime/function_testlib.h"
16
17 #include "tensorflow/core/common_runtime/device.h"
18 #include "tensorflow/core/framework/common_shape_fns.h"
19 #include "tensorflow/core/framework/node_def.pb.h"
20 #include "tensorflow/core/framework/node_def_builder.h"
21 #include "tensorflow/core/framework/op_kernel.h"
22
23 namespace tensorflow {
24 namespace test {
25 namespace function {
26
27 typedef FunctionDefHelper FDH;
28
29 class FindDeviceOpKernel : public OpKernel {
30 public:
FindDeviceOpKernel(OpKernelConstruction * ctx)31 explicit FindDeviceOpKernel(OpKernelConstruction* ctx) : OpKernel(ctx) {}
Compute(OpKernelContext * ctx)32 void Compute(OpKernelContext* ctx) override {
33 Tensor* device_tensor = nullptr;
34 OP_REQUIRES_OK(ctx, ctx->allocate_output("device_name", TensorShape{},
35 &device_tensor));
36 device_tensor->scalar<tstring>()() =
37 ctx->function_library()->device()->name();
38 }
39 };
40
41 REGISTER_KERNEL_BUILDER(Name("FindDeviceOp").Device(tensorflow::DEVICE_CPU),
42 FindDeviceOpKernel);
43 REGISTER_OP("FindDeviceOp")
44 .Output("device_name: string")
45 .SetShapeFn(shape_inference::UnknownShape);
46
FindDevice()47 FunctionDef FindDevice() {
48 return FDH::Define(
49 // Name
50 "FindDevice",
51 // Args
52 {},
53 // Return values
54 {"device_name: string"},
55 // Attr def
56 {},
57 // Nodes
58 {{{"device_name"}, "FindDeviceOp", {}, {}}});
59 }
60
AwaitState(int awaiting_state)61 void BlockingOpState::AwaitState(int awaiting_state) {
62 mutex_lock ml(mu_);
63 while (state_ != awaiting_state) {
64 cv_.wait(ml);
65 }
66 }
67
MoveToState(int expected_current,int next)68 void BlockingOpState::MoveToState(int expected_current, int next) {
69 mutex_lock ml(mu_);
70 CHECK_EQ(expected_current, state_);
71 state_ = next;
72 cv_.notify_all();
73 }
74
75 BlockingOpState* blocking_op_state = nullptr;
76
77 // BlockingOp blocks on the global <blocking_op_state's> state,
78 // and also updates it when it is unblocked and finishing computation.
79 class BlockingOp : public OpKernel {
80 public:
BlockingOp(OpKernelConstruction * ctx)81 explicit BlockingOp(OpKernelConstruction* ctx) : OpKernel(ctx) {}
Compute(OpKernelContext * ctx)82 void Compute(OpKernelContext* ctx) override {
83 blocking_op_state->MoveToState(0, 1);
84 blocking_op_state->AwaitState(2);
85 blocking_op_state->MoveToState(2, 3);
86
87 Tensor* out = nullptr;
88 const Tensor& in = ctx->input(0);
89 OP_REQUIRES_OK(ctx, ctx->allocate_output(0, in.shape(), &out));
90 out->flat<float>() = in.flat<float>();
91 }
92 };
93 REGISTER_KERNEL_BUILDER(Name("BlockingOp").Device(DEVICE_CPU), BlockingOp);
94 REGISTER_OP("BlockingOp")
95 .Input("x: float")
96 .Output("y: float")
97 .Doc("")
98 .SetShapeFn(shape_inference::UnknownShape);
99
BlockingOpFn()100 FunctionDef BlockingOpFn() {
101 return FDH::Define(
102 // Name
103 "BlockingOpFn",
104 // Args
105 {"x: float"},
106 // Return values
107 {"y: float"},
108 // Attr def
109 {},
110 // Nodes
111 {{{"y"}, "BlockingOp", {"x"}, {}}});
112 }
113
114 // TODO(phawkins): replace with C++ API for calling functions, when that exists.
Call(Scope * scope,const string & op_name,const string & fn_name,gtl::ArraySlice<Input> inputs)115 Output Call(Scope* scope, const string& op_name, const string& fn_name,
116 gtl::ArraySlice<Input> inputs) {
117 NodeDef def;
118 NodeDefBuilder builder(op_name, fn_name, scope->graph()->op_registry());
119 for (const Input& input : inputs) {
120 builder.Input(input.node()->name(), input.index(),
121 input.node()->output_type(input.index()));
122 }
123 TF_CHECK_OK(builder.Finalize(&def));
124 Status status;
125 Node* n = scope->graph()->AddNode(def, &status);
126 TF_CHECK_OK(status);
127 TF_CHECK_OK(scope->DoShapeInference(n));
128 for (int i = 0; i < inputs.size(); ++i) {
129 scope->graph()->AddEdge(inputs[i].node(), inputs[i].index(), n, i);
130 }
131 return Output(n);
132 }
133
134 } // namespace function
135 } // namespace test
136 } // namespace tensorflow
137