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 = \(\infty\), 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

\[L_{out} = \left\lfloor\frac{L_{in} - \text{kernel_size}}{\text{stride}} + 1\right\rfloor\]

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 numpy as np
>>> a = ms.Tensor(np.arange(2 * 3 * 4).reshape((2, 3, 4)), dtype=ms.float32)
>>> net = ms.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.]]]