Automated rollback of commit 0bc46a1602. Revert #26682.

PiperOrigin-RevId: 239098662

tensorflow/go/session.go

@@ -18,7 +18,6 @@ package tensorflow
 
 // #include <stdlib.h>
 // #include "tensorflow/c/c_api.h"
-// #include "tensorflow/c/c_api_experimental.h"
 import "C"
 
 import (
@@ -316,11 +315,6 @@ type SessionOptions struct {
 	// Config is a binary-serialized representation of the
 	// tensorflow.ConfigProto protocol message
 	// (https://www.tensorflow.org/code/tensorflow/core/protobuf/config.proto).
-	// You can populate this field in three ways. You can use the zero value
-	// of this field, which configures the session with a default set of
-	// options. Or you create a `Config` struct with your options and call that
-	// struct's `Bytes()` method. Or you can generate a byte string outside of
-	// Go and paste that string into your Go program as a string literal.
 	Config []byte
 }
 
@@ -355,81 +349,6 @@ func (o *SessionOptions) c() (ret *C.TF_SessionOptions, done func(), err error)
 	}, nil
 }
 
-// JitLevel represents the level of optimization that the XLA compiler
-// performs during just-in-time compilation.
-type JitLevel int
-
-const (
-	// JitDefault is the default setting for this version of TensorFlow
-	// and corresponds to the "DEFAULT" level in the Python API.
-	// Currently the default is `JitOff`, but it will change to `JitOn` in a
-	// future version.
-	JitDefault JitLevel = 0
-	// JitOff disables just-in-time compilation and will continue to do so
-	// even after JIT compilation is enabled by default.
-	JitOff JitLevel = -1
-	// JitOn enables just-in-time compilation. It is a synonym for the
-	// "ON_1" optimization level in the Python API.
-	JitOn JitLevel = 1
-)
-
-// Config represents session parameters as encoded in the tensorflow.ConfigProto
-// protocol buffer message.
-type Config struct {
-	// GlobalJitLevel controls the degree of optimization that the XLA just-in-time
-	// compiler will perform. The default is currently "off", but it is expected
-	// to change to "on" in a future version of TensorFlow.
-	GlobalJitLevel JitLevel
-
-	// AllowGPUMemoryGrowth controls whether the TensorFlow memory allocator
-	// pre-allocates the entire specified GPU memory region or instead starts
-	// with a small block of GPU memory and grows its memory usage as needed.
-	AllowGPUMemoryGrowth bool
-
-	// NumCPUs is the maximum number of CPU devices that the session will use.
-	// A value of 0 means "let the system pick an appropriate number"
-	NumCPUs int
-
-	// This struct only exposes the session options available via TensorFlow's
-	// experimental C API function `TF_CreateConfig()`.
-	// TODO(frreiss): Add additional options here as more session options are
-	// exposed via the C API.
-}
-
-// Bytes generates a serialized ConfigOptions protobuf for use in the `Config`
-// field of a `SessionOptions` struct.
-func (c *Config) Bytes() []byte {
-	// The C API expects an unsigned char that is 0 if XLA compilation is off and
-	// nonzero otherwise.
-	// There is currently no way in the C API to specify "use TensorFlow's default
-	// JIT level".  The translation logic here ensures that the zero value of
-	// c.GlobalJitLevel means the same as the default value of
-	// OptimizerOptions.global_jit_level in the Python API.
-	enableXLACompilationAsChar := C.uchar(0)
-	switch c.GlobalJitLevel {
-	case JitDefault:
-		// TODO(frreiss): When the semantics of GlobalJitLevel.DEFAULT change to
-		// "on", uncomment the following line.
-		// enableXLACompilationAsChar = C.uchar(1)
-	case JitOn:
-		enableXLACompilationAsChar = C.uchar(1)
-	}
-	gpuMemoryAllowGrowthAsChar := C.uchar(0)
-	if c.AllowGPUMemoryGrowth {
-		gpuMemoryAllowGrowthAsChar = 1
-	}
-	// The C API doesn't currently have a way to say "let the system pick how many
-	// CPUs to use," so detect the number of CPUs here.
-	numCPUDevicesAsUint := C.uint(runtime.NumCPU())
-	if c.NumCPUs > 0 {
-		numCPUDevicesAsUint = C.uint(c.NumCPUs)
-	}
-	buf := C.TF_CreateConfig(enableXLACompilationAsChar, gpuMemoryAllowGrowthAsChar, numCPUDevicesAsUint)
-	defer C.TF_DeleteBuffer(buf)
-	// Copy out of C memory.
-	return C.GoBytes(unsafe.Pointer(buf.data), C.int(buf.length))
-}
-
 // cRunArgs translates the arguments to Session.Run and PartialRun.Run into
 // values suitable for C library calls.
 type cRunArgs struct {

tensorflow/go/session_test.go

@@ -250,15 +250,27 @@ func ExamplePartialRun() {
 }
 
 func TestSessionConfig(t *testing.T) {
-	// Exercise SessionOptions and Config structs
+	// Exercise SessionOptions.
+	// Arguably, a better API would be for SessionOptions.Config to be the
+	// type generated by the protocol buffer compiler. But for now, the
+	// tensorflow package continues to be independent of protocol buffers
+	// and this test exercises the option since the implementation has a
+	// nuanced conversion to C types.
+	//
+	// Till then, the []byte form of Config here was generated using a toy
+	// tensorflow Python program:
+	/*
+	 import tensorflow
+	 c = tensorflow.ConfigProto()
+	 c.intra_op_parallelism_threads = 1
+	 print c.SerializeToString()
+	*/
 	graph := NewGraph()
 	c, err := Const(graph, "Const", int32(14))
 	if err != nil {
 		t.Fatal(err)
 	}
-	// Use the zero values for Config.GlobalJitLevel and NumCPUs
-	config := Config{AllowGPUMemoryGrowth: true}
-	opts := SessionOptions{Config: config.Bytes()}
+	opts := SessionOptions{Config: []byte("(\x01")}
 	s, err := NewSession(graph, &opts)
 	if err != nil {
 		t.Fatal(err)