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mindspore.nn.ConstantPad1d

class mindspore.nn.ConstantPad1d(padding, value)

Using a given constant value to pads the last dimensions of input tensor.

Parameters

• padding (Union[int, tuple]) – The padding size to pad the last dimension of input tensor. If is int, uses the same padding in both boundaries of input's last dimension. If a 2-tuple, uses (padding_0, padding_1) to pad. If the input is x, the size of last dimension of output is $padding\mathrm{\_}0+x.shape[-1]+padding\mathrm{\_}1$. The remaining dimensions of the output are consistent with those of the input. Only support non-negative value while running in Ascend.

• value (Union[int, float]) – Padding value.

Inputs:

• x (Tensor) - shape is $(N,\ast )$, where $\ast$ means, any number of additional dimensions. It is not supported that the size of dimensions is greater than 5 while running on Ascend.

Returns

Tensor, the tensor after padding.

Raises

• TypeError – If padding is not a tuple or int.

• TypeError – If value is not int or float.

• ValueError – If the length of padding with tuple type is not equal to 2.

• ValueError – If the output shape after padding is not positive.

• ValueError – If the rank of 'x' is more than 5 while running in Ascend.

• ValueError – If padding contains negative value while running in Ascend.

Supported Platforms:

Ascend GPU CPU

Examples

>>> import numpy as np
>>> import mindspore as ms
>>> x = np.ones(shape=(1, 2, 3, 4)).astype(np.float32)
>>> x = ms.Tensor(x)
>>> # padding is tuple
>>> padding = (0, 1)
>>> value = 0.5
>>> pad1d = ms.nn.ConstantPad1d(padding, value)
>>> out = pad1d(x)
>>> print(out)
[[[[1.  1.  1.  1.  0.5]
   [1.  1.  1.  1.  0.5]
   [1.  1.  1.  1.  0.5]]
  [[1.  1.  1.  1.  0.5]
   [1.  1.  1.  1.  0.5]
   [1.  1.  1.  1.  0.5]]]]
>>> print(out.shape)
(1, 2, 3, 5)
>>> # padding is int
>>> padding = 1
>>> value = 0.5
>>> pad1d = ms.nn.ConstantPad1d(padding, value)
>>> out = pad1d(x)
>>> print(out)
[[[[0.5 1.  1.  1.  1.  0.5]
   [0.5 1.  1.  1.  1.  0.5]
   [0.5 1.  1.  1.  1.  0.5]]
  [[0.5 1.  1.  1.  1.  0.5]
   [0.5 1.  1.  1.  1.  0.5]
   [0.5 1.  1.  1.  1.  0.5]]]]
>>> print(out.shape)
(1, 2, 3, 6)