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// Copyright 2016 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.
package tensorflow
// #include <stdlib.h>
// #include "tensorflow/c/c_api.h"
import "C"
import "unsafe"
// Operation that has been added to the graph.
type Operation struct {
c *C.TF_Operation
// A reference to the Graph to prevent it from
// being GCed while the Operation is still alive.
g *Graph
}
// Name returns the name of the operation.
func (op *Operation) Name() string {
return C.GoString(C.TF_OperationName(op.c))
}
// Type returns the name of the operator used by this operation.
func (op *Operation) Type() string {
return C.GoString(C.TF_OperationOpType(op.c))
}
// NumOutputs returns the number of outputs of op.
func (op *Operation) NumOutputs() int {
return int(C.TF_OperationNumOutputs(op.c))
}
// OutputListSize returns the size of the list of Outputs that is produced by a
// named output of op.
//
// An Operation has multiple named outputs, each of which produces either
// a single tensor or a list of tensors. This method returns the size of
// the list of tensors for a specific output of the operation, identified
// by its name.
func (op *Operation) OutputListSize(output string) (int, error) {
cname := C.CString(output)
defer C.free(unsafe.Pointer(cname))
status := newStatus()
n := C.TF_OperationOutputListLength(op.c, cname, status.c)
return int(n), status.Err()
}
// Output returns the i-th output of op.
func (op *Operation) Output(i int) Output {
return Output{op, i}
}
// Output represents one of the outputs of an operation in the graph. Has a
// DataType (and eventually a Shape). May be passed as an input argument to a
// function for adding operations to a graph, or to a Session's Run() method to
// fetch that output as a tensor.
type Output struct {
// Op is the Operation that produces this Output.
Op *Operation
// Index specifies the index of the output within the Operation.
Index int
}
// DataType returns the type of elements in the tensor produced by p.
func (p Output) DataType() DataType {
return DataType(C.TF_OperationOutputType(p.c()))
}
// Shape returns the (possibly incomplete) shape of the tensor produced p.
func (p Output) Shape() Shape {
status := newStatus()
port := p.c()
ndims := C.TF_GraphGetTensorNumDims(p.Op.g.c, port, status.c)
if err := status.Err(); err != nil {
// This should not be possible since an error only occurs if
// the operation does not belong to the graph. It should not
// be possible to construct such an Operation object.
return Shape{}
}
if ndims < 0 {
return Shape{}
}
if ndims == 0 {
return ScalarShape()
}
dims := make([]C.int64_t, ndims)
C.TF_GraphGetTensorShape(p.Op.g.c, port, &dims[0], ndims, status.c)
if err := status.Err(); err != nil {
// Same as above, should not be possible.
return Shape{}
}
ret := Shape{dims: make([]int64, ndims)}
for i := 0; i < int(ndims); i++ {
ret.dims[i] = int64(dims[i])
}
return ret
}
func (p Output) c() C.TF_Output {
return C.TF_Output{oper: p.Op.c, index: C.int(p.Index)}
}
func (p Output) canBeAnInput() {}
// Input is the interface for specifying inputs to an operation being added to
// a Graph.
//
// Operations can have multiple inputs, each of which could be either a tensor
// produced by another operation (an Output object), or a list of tensors
// produced by other operations (an OutputList). Thus, this interface is
// implemented by both Output and OutputList.
//
// See OpSpec.Input for more information.
type Input interface {
// Unexported to preclude implementations outside this package.
canBeAnInput()
}
// OutputList represents a list of Outputs that can be provided as input to
// another operation.
type OutputList []Output
func (l OutputList) canBeAnInput() {}
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