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mindspore.nn.LPPool1d

class mindspore.nn.LPPool1d(norm_type, kernel_size, stride=None, ceil_mode=False)

Applying 1D LPPooling operation on an input Tensor can be regarded as forming a 1D input plane.

Typically the input is of shape $(N_{in},C_{in},L_{in})$ or $(C_{in},L_{in})$, the output is of shape $(N_{out},C_{out},L_{out})$ or $(C_{out},L_{out})$, with the same shape as input, the operation is as follows.

$$f(X)=\sqrt[p]{\sum _{x\in X}{x}^p}$$

Parameters

• norm_type (Union[int, float]) –

  Type of normalization, represents p in the formula, can not be 0.

  • if p = 1, the result is the sum of the elements within the pooling kernel(proportional to average pooling).

  • if p = $\mathrm{\infty }$, the result is the result of maximum pooling.

• kernel_size (int) – The size of kernel window.

• stride (int) – The distance of kernel moving, an int number that represents the width of movement is stride. If the value is None, the default value kernel_size is used. Default: None.

• ceil_mode (bool) – Whether to use ceil or floor to calculate output shape. Default: False.

Inputs:

• x (Tensor) - Tensor of shape $(N_{in},C_{in},L_{in})$ or $(C_{in},L_{in})$.

Outputs:

• output (Tensor) - LPPool1d result, with shape $(N_{out},C_{out},L_{out})$ or $(C_{out},L_{out})$, it has the same data type as x, where

$$L_{out}=\lfloor \frac{L_{in}-\text{kernel\_size}}{\text{stride}}+1\rfloor$$

Raises

• TypeError – If x is not an Tensor.

• TypeError – If kernel_size or stride is not an int.

• TypeError – If ceil_mode is not a bool.

• TypeError – If norm_type is neither float nor int.

• ValueError – If norm_type is equal to 0.

• ValueError – If kernel_size or stride is less than 1.

• ValueError – If length of shape of x is not equal to 2 or 3.

Supported Platforms:

Ascend GPU CPU

Examples

>>> import mindspore as ms
>>> import mindspore.nn as nn
>>> from mindspore import Tensor
>>> import numpy as np
>>> a = Tensor(np.arange(2 * 3 * 4).reshape((2, 3, 4)), dtype=ms.float32)
>>> net = nn.LPPool1d(norm_type=1, kernel_size=3, stride=1)
>>> out = net(a)
>>> print(out)
[[[ 3.  6.]
  [15. 18.]
  [27. 30.]]
 [[39. 42.]
  [51. 54.]
  [63. 66.]]]