Allow forwarding inputs in eager

PiperOrigin-RevId: 226396223

tensorflow/c/eager/BUILD

@@ -148,6 +148,62 @@ tf_cuda_cc_test(
     ],
 )
 
+tf_cuda_library(
+    name = "c_api_experimental",
+    srcs = [
+        "c_api_experimental.cc",
+    ],
+    hdrs = ["c_api_experimental.h"],
+    copts = tf_copts() + tfe_xla_copts(),
+    visibility = ["//visibility:public"],
+    deps = select({
+        "//tensorflow:android": [
+            "//tensorflow/core:android_tensorflow_lib_lite",
+        ],
+        "//conditions:default": [
+            ":c_api",
+            ":c_api_internal",
+            "//tensorflow/c:c_api",
+            "//tensorflow/c:c_api_internal",
+            "//tensorflow/core:core_cpu",
+            "//tensorflow/core/common_runtime/eager:attr_builder",
+            "//tensorflow/core/common_runtime/eager:context",
+            "//tensorflow/core/common_runtime/eager:eager_executor",
+            "//tensorflow/core/common_runtime/eager:execute",
+            "//tensorflow/core/common_runtime/eager:kernel_and_device",
+            "//tensorflow/core/common_runtime/eager:tensor_handle",
+            "//tensorflow/core/common_runtime/eager:copy_to_device_node",
+            "//tensorflow/core:core_cpu_internal",
+            "//tensorflow/core:framework",
+            "//tensorflow/core:framework_internal",
+            "//tensorflow/core:lib",
+            "//tensorflow/core:lib_internal",
+            "//tensorflow/core:protos_all_cc",
+        ],
+    }) + select({
+        "//tensorflow:with_xla_support": [
+            "//tensorflow/compiler/tf2xla:xla_compiler",
+            "//tensorflow/compiler/jit",
+            "//tensorflow/compiler/jit:xla_device",
+        ],
+        "//conditions:default": [],
+    }) + [
+        "@com_google_absl//absl/memory",
+        "//tensorflow/core/common_runtime/eager:eager_operation",
+        "//tensorflow/core/distributed_runtime/eager:eager_client",
+        "//tensorflow/core/distributed_runtime/rpc/eager:grpc_eager_client",
+        "//tensorflow/core/distributed_runtime/rpc:grpc_channel",
+        "//tensorflow/core/distributed_runtime/rpc:grpc_server_lib",
+        "//tensorflow/core/distributed_runtime/rpc:grpc_worker_cache",
+        "//tensorflow/core/distributed_runtime/rpc:grpc_worker_service",
+        "//tensorflow/core/distributed_runtime/rpc:rpc_rendezvous_mgr",
+        "//tensorflow/core/distributed_runtime:remote_device",
+        "//tensorflow/core/distributed_runtime:server_lib",
+        "//tensorflow/core/distributed_runtime:worker_env",
+        "//tensorflow/core:gpu_runtime",
+    ],
+)
+
 cc_library(
     name = "tape",
     hdrs = ["tape.h"],

tensorflow/c/eager/c_api_experimental.cc

@@ -0,0 +1,23 @@
+/* Copyright 2018 The TensorFlow Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+==============================================================================*/
+
+#include "tensorflow/c/eager/c_api_experimental.h"
+
+#include "tensorflow/c/c_api.h"
+#include "tensorflow/c/eager/c_api_internal.h"
+
+void TFE_OpConsumeInput(TFE_Op* op, TFE_TensorHandle* h, TF_Status* status) {
+  op->operation.ConsumeInput(h->handle);
+}

tensorflow/c/eager/c_api_experimental.h

@@ -0,0 +1,32 @@
+/* Copyright 2018 The TensorFlow Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+==============================================================================*/
+#ifndef TENSORFLOW_C_EAGER_C_API_EXPERIMENTAL_H_
+#define TENSORFLOW_C_EAGER_C_API_EXPERIMENTAL_H_
+
+#include "tensorflow/c/c_api.h"
+#include "tensorflow/c/eager/c_api.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+TF_CAPI_EXPORT extern void TFE_OpConsumeInput(TFE_Op* op, TFE_TensorHandle* h,
+                                              TF_Status* status);
+
+#ifdef __cplusplus
+} /* end extern "C" */
+#endif
+
+#endif  // TENSORFLOW_C_EAGER_C_API_EXPERIMENTAL_H_

tensorflow/core/common_runtime/eager/eager_operation.cc

@@ -30,4 +30,9 @@ void EagerOperation::AddInput(tensorflow::TensorHandle* h) {
   inputs_.push_back(h);
   attrs_.NumInputs(static_cast<int>(inputs_.size()));
 }
+
+void EagerOperation::ConsumeInput(tensorflow::TensorHandle* h) {
+  inputs_.push_back(h);
+  attrs_.NumInputs(static_cast<int>(inputs_.size()));
+}
 }  // namespace tensorflow

tensorflow/core/common_runtime/eager/eager_operation.h

@@ -53,6 +53,7 @@ class EagerOperation {
     return &inputs_;
   }
   void AddInput(tensorflow::TensorHandle* h);
+  void ConsumeInput(tensorflow::TensorHandle* h);
 
   const tensorflow::string& Name() const { return name_; }
   const tensorflow::AttrTypeMap* AttrTypes() const { return attr_types_; }

tensorflow/core/common_runtime/eager/execute.cc

@@ -712,22 +712,37 @@ Status EagerExecute(EagerContext* ctx, Device* device,
   std::vector<Tensor> outputs(1);
   const MemoryTypeVector* output_memory_types = nullptr;
   output_memory_types = &kernel->kernel()->output_memory_types();
-  std::vector<Tensor> inputs(op_inputs.size());
+
+  // If there are multiple references to a TensorHandle in 'op_inputs' we must
+  // increment the reference count of the corresponding Tensor or risk it being
+  // overwritten during kernel execution. The reference count is incremented
+  // below when we insert a copy of the Tensor into protected_tensors, and will
+  // be decremented once execution is complete.
+  std::vector<tensorflow::Tensor> protected_tensors;
   for (int i = 0; i < op_inputs.size(); ++i) {
+    if (!op_inputs[i]->RefCountIsOne()) {
       const Tensor* input_tensor = nullptr;
       TF_RETURN_IF_ERROR(op_inputs[i]->Tensor(&input_tensor));
-    inputs[i] = *input_tensor;
+      protected_tensors.push_back(*input_tensor);
     }
+  }
+
+  gtl::InlinedVector<TensorValue, 4> input_vector(op_inputs.size());
+  for (int i = 0; i < op_inputs.size(); ++i) {
+    TF_RETURN_IF_ERROR(op_inputs[i]->TensorValue(&input_vector[i]));
+  }
+
   //  TODO(apassos) figure out how to record stats for ops which are a part of
   //  functions.
   // TODO(agarwal): change Run to take vector of handles ?
   ScopedStepContainer* container = ctx->StepContainer();
   if (container == nullptr) {
-    TF_RETURN_IF_ERROR(kernel->Run(&inputs, &outputs, maybe_stats,
+    TF_RETURN_IF_ERROR(kernel->Run(input_vector, &outputs, maybe_stats,
                                    maybe_step_stats, graph_collector));
   } else {
-    TF_RETURN_IF_ERROR(kernel->Run(container, &inputs, &outputs, maybe_stats,
-                                   maybe_step_stats, graph_collector));
+    TF_RETURN_IF_ERROR(kernel->Run(container, input_vector, &outputs,
+                                   maybe_stats, maybe_step_stats,
+                                   graph_collector));
   }
   if (maybe_stats != nullptr) {
     int64 nanos = Env::Default()->NowNanos();

tensorflow/core/common_runtime/eager/kernel_and_device.cc

@@ -57,7 +57,7 @@ Status KernelAndDevice::Init(const NodeDef& ndef, FunctionLibraryRuntime* flr,
   return OutputTypesForNode(ndef, *op_def, &out->output_dtypes_);
 }
 
-Status KernelAndDevice::Run(std::vector<Tensor>* inputs,
+Status KernelAndDevice::Run(const gtl::InlinedVector<TensorValue, 4>& inputs,
                             std::vector<Tensor>* outputs, NodeExecStats* stats,
                             StepStats* step_stats,
                             GraphCollector* graph_collector) {
@@ -69,15 +69,10 @@ Status KernelAndDevice::Run(std::vector<Tensor>* inputs,
 }
 
 Status KernelAndDevice::Run(ScopedStepContainer* step_container,
-                            std::vector<Tensor>* inputs,
+                            const gtl::InlinedVector<TensorValue, 4>& inputs,
                             std::vector<Tensor>* outputs, NodeExecStats* stats,
                             StepStats* step_stats,
                             GraphCollector* graph_collector) {
-  gtl::InlinedVector<TensorValue, 4> input_vector;
-  for (Tensor& t : *inputs) {
-    input_vector.push_back(TensorValue(&t));
-  }
-
   std::vector<AllocatorAttributes> out_attrs(kernel_->num_outputs());
   for (size_t i = 0; i < out_attrs.size(); ++i) {
     out_attrs[i].set_on_host(kernel_->output_memory_types()[i] ==
@@ -85,7 +80,7 @@ Status KernelAndDevice::Run(ScopedStepContainer* step_container,
   }
 
   gtl::InlinedVector<DeviceContext*, 4> input_device_contexts;
-  for (int i = 0; i < inputs->size(); i++) {
+  for (int i = 0; i < inputs.size(); i++) {
     DeviceContext* device_context = nullptr;
     if (device_->tensorflow_gpu_device_info() != nullptr) {
       device_context = device_->tensorflow_gpu_device_info()->default_context;
@@ -96,7 +91,7 @@ Status KernelAndDevice::Run(ScopedStepContainer* step_container,
   OpKernelContext::Params params;
   params.device = device_;
   params.frame_iter = FrameAndIter(0, 0);
-  params.inputs = &input_vector;
+  params.inputs = &inputs;
   params.op_kernel = kernel_.get();
   params.resource_manager = device_->resource_manager();
   params.output_attr_array = gtl::vector_as_array(&out_attrs);

tensorflow/core/common_runtime/eager/kernel_and_device.h

@@ -68,11 +68,12 @@ class KernelAndDevice {
         collective_executor_(std::move(collective_executor)) {}
 
   // TODO(ashankar): Handle list-valued inputs.
-  Status Run(std::vector<Tensor>* inputs, std::vector<Tensor>* outputs,
-             NodeExecStats* stats, StepStats* step_stats,
-             GraphCollector* graph_collector);
+  Status Run(const gtl::InlinedVector<TensorValue, 4>& inputs,
+             std::vector<Tensor>* outputs, NodeExecStats* stats,
+             StepStats* step_stats, GraphCollector* graph_collector);
 
-  Status Run(ScopedStepContainer* step_container, std::vector<Tensor>* inputs,
+  Status Run(ScopedStepContainer* step_container,
+             const gtl::InlinedVector<TensorValue, 4>& inputs,
              std::vector<Tensor>* outputs, NodeExecStats* stats,
              StepStats* step_stats, GraphCollector* graph_collector);
 

tensorflow/core/common_runtime/eager/kernel_and_device_test.cc

@@ -118,9 +118,9 @@ BENCHMARK(BM_KernelAndDeviceInit);
 void BM_KernelAndDeviceRun(int iters) {
   tensorflow::testing::StopTiming();
   Tensor t(Input({{1.0f, 2.0f}, {3.0f, 4.0f}}).tensor());
-  std::vector<Tensor> inputs;
-  inputs.push_back(t);
-  inputs.push_back(t);
+  gtl::InlinedVector<TensorValue, 4> inputs;
+  inputs.push_back(TensorValue(&t));
+  inputs.push_back(TensorValue(&t));
   std::vector<Tensor> outputs;
   NodeDef ndef(AttrBuilder("MatMul")
                    .Set("T", DT_FLOAT)
@@ -134,7 +134,7 @@ void BM_KernelAndDeviceRun(int iters) {
                                     nullptr, &kernel));
   tensorflow::testing::StartTiming();
   for (int i = 0; i < iters; ++i) {
-    TF_CHECK_OK(kernel.Run(&inputs, &outputs, nullptr, nullptr, nullptr));
+    TF_CHECK_OK(kernel.Run(inputs, &outputs, nullptr, nullptr, nullptr));
   }
 }
 BENCHMARK(BM_KernelAndDeviceRun);

tensorflow/core/common_runtime/eager/tensor_handle.cc

@@ -27,7 +27,6 @@ limitations under the License.
 #include "tensorflow/core/common_runtime/device_factory.h"
 #include "tensorflow/core/common_runtime/eager/context.h"
 #include "tensorflow/core/common_runtime/eager/eager_executor.h"
-#include "tensorflow/core/common_runtime/eager/kernel_and_device.h"
 #include "tensorflow/core/common_runtime/function.h"
 #include "tensorflow/core/common_runtime/rendezvous_mgr.h"
 #include "tensorflow/core/framework/rendezvous.h"
@@ -79,6 +78,13 @@ Status TensorHandle::Tensor(const tensorflow::Tensor** t) {
   return Status::OK();
 }
 
+Status TensorHandle::TensorValue(tensorflow::TensorValue* t) {
+  TF_RETURN_IF_ERROR(WaitReady());
+  DCHECK(IsReady());
+  *t = tensorflow::TensorValue(&tensor_);
+  return Status::OK();
+}
+
 Status TensorHandle::TensorAndDevice(const tensorflow::Tensor** tensor,
                                      tensorflow::Device** device,
                                      tensorflow::Device** op_device) {

tensorflow/core/common_runtime/eager/tensor_handle.h

@@ -27,7 +27,6 @@ limitations under the License.
 #include "tensorflow/core/common_runtime/device_factory.h"
 #include "tensorflow/core/common_runtime/eager/context.h"
 #include "tensorflow/core/common_runtime/eager/eager_executor.h"
-#include "tensorflow/core/common_runtime/eager/kernel_and_device.h"
 #include "tensorflow/core/common_runtime/function.h"
 #include "tensorflow/core/common_runtime/rendezvous_mgr.h"
 #include "tensorflow/core/framework/rendezvous.h"
@@ -102,6 +101,8 @@ class TensorHandle : public core::RefCounted {
 
   Status Tensor(const tensorflow::Tensor** t);
 
+  Status TensorValue(tensorflow::TensorValue* t);
+
   tensorflow::Device* device() const { return device_; }
 
   tensorflow::Device* op_device() const { return op_device_; }