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// Copyright 2020 NLP Odyssey Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package pytorch
import (
"fmt"
"github.com/nlpodyssey/gopickle/types"
)
type RebuildTensorV2 struct{}
var _ types.Callable = &RebuildTensorV2{}
func (r *RebuildTensorV2) Call(args ...interface{}) (interface{}, error) {
if len(args) != 6 {
return nil, fmt.Errorf("RebuildTensorV2 unexpected args: %#v", args)
}
storage, storageOk := args[0].(StorageInterface)
storageOffset, storageOffsetOk := args[1].(int)
size, sizeOk := args[2].(*types.Tuple)
stride, strideOk := args[3].(*types.Tuple)
requiresGrad, requiresGradOk := args[4].(bool)
// arg[5] "backward hooks" is unused
if !storageOk || !storageOffsetOk || !sizeOk || !strideOk ||
!requiresGradOk {
return nil, fmt.Errorf("RebuildTensorV2 unexpected args: %#v", args)
}
tensor := &Tensor{
Source: storage,
StorageOffset: storageOffset,
RequiresGrad: requiresGrad,
}
var err error
tensor.Size, err = tupleToIntSlice(size)
if err != nil {
return nil, err
}
tensor.Stride, err = tupleToIntSlice(stride)
if err != nil {
return nil, err
}
return tensor, nil
}
func tupleToIntSlice(tuple *types.Tuple) ([]int, error) {
length := tuple.Len()
slice := make([]int, length)
for i := 0; i < length; i++ {
value, ok := tuple.Get(i).(int)
if !ok {
return nil, fmt.Errorf("tuple of ints expected: %#v", tuple)
}
slice[i] = value
}
return slice, nil
}
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