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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.

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

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.

Supported Platforms:

Ascend GPU CPU

Examples

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