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Specifications and Common Mistakes

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mindspore.ops.Slice

class mindspore.ops.Slice

Slices a tensor in the specified shape.

Slice the tensor input_x in shape of size and starting at the location specified by begin, The slice begin represents the offset in each dimension of input_x, The slice size represents the size of the output tensor.

Note that begin is zero-based and size is one-based.

If size[i] is -1, all remaining elements in dimension i are included in the slice. This is equivalent to setting $size[i]=inpu{t}_x.shape(i)-begin[i]$.

Inputs:

• input_x (Tensor): The target tensor. The shape is $(N,\ast )$ where $\ast$ means, any number of additional dimensions.

• begin (Union[tuple, list]): The beginning of the slice. Only constant value(>=0) is allowed.

• size (Union[tuple, list]): The size of the slice. Only constant value is allowed.

Outputs:

Tensor, the shape is : input size, the data type is the same as input_x.

Raises

TypeError – If begin or size is neither tuple nor list.

Supported Platforms:

Ascend GPU CPU

Examples

>>> data = Tensor(np.array([[[1, 1, 1], [2, 2, 2]],
...                         [[3, 3, 3], [4, 4, 4]],
...                         [[5, 5, 5], [6, 6, 6]]]).astype(np.int32))
>>> slice_op = ops.Slice()
>>> output = slice_op(data, (1, 0, 0), (1, 1, 3))
>>> print(output)
[[[3 3 3]]]
>>> output = slice_op(data, (1, 0, 0), (1, 1, 2))
>>> print(output)
[[[3 3]]]
>>> output = slice_op(data, (1, 0, 0), (1, 1, 1))
>>> print(output)
[[[3]]]
>>> output = slice_op(data, (1, 1, 0), (1, 1, 3))
>>> print(output)
[[[4 4 4]]]
>>> output = slice_op(data, (1, 0, 1), (1, 1, 2))
>>> print(output)
[[[3 3]]]