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mindspore.ops.ReduceProd

class mindspore.ops.ReduceProd(keep_dims=False)[source]

Reduces a dimension of a tensor by multiplying all elements in the dimension, by default. And also can reduce a dimension of x along the axis. Determine whether the dimensions of the output and input are the same by controlling keep_dims.

Note

The axis with tensor type is only used for compatibility with older versions and is not recommended.

Parameters: keep_dims (bool) – If True , keep these reduced dimensions and the length is 1. If False , don't keep these dimensions. Default: False .

Inputs:

x (Tensor[Number]) - The input tensor.
axis (Union[int, tuple(int), list(int), Tensor]) - The dimensions to reduce. Default: () , reduce all dimensions. Only constant value is allowed. Must be in the range [-r, r).

Outputs:

Tensor, has the same dtype as the x.

If axis is () , and keep_dims is False , the output is a 0-D tensor representing the product of all elements in the input tensor.
If axis is int, set as 1, and keep_dims is False , the shape of output is $(x_{0}, x_{2}, . . ., x_{R})$ .
If axis is tuple(int), set as (1, 2), and keep_dims is False , the shape of output is $(x_{0}, x_{3}, . . ., x_{R})$ .
If axis is 1-D Tensor, set as [1, 2], and keep_dims is False , the shape of output is $(x_{0}, x_{3}, . . ., x_{R})$ .

Raises

TypeError – If keep_dims is not a bool.
TypeError – If x is not a Tensor.
TypeError – If axis is not one of the following: int, tuple, list or Tensor.
ValueError – If axis is out of range.

Supported Platforms:: Ascend GPU CPU

Examples

>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> x = Tensor(np.random.randn(3, 4, 5, 6).astype(np.float32))
>>> op = ops.ReduceProd(keep_dims=True)
>>> output = op(x, 1)
>>> result = output.shape
>>> print(result)
(3, 1, 5, 6)
>>> # case 1: Reduces a dimension by multiplying all elements in the dimension.
>>> x = Tensor(np.array([[[1, 1, 1, 1, 1, 1], [2, 2, 2, 2, 2, 2], [3, 3, 3, 3, 3, 3]],
...                      [[4, 4, 4, 4, 4, 4], [5, 5, 5, 5, 5, 5], [6, 6, 6, 6, 6, 6]],
...                      [[7, 7, 7, 7, 7, 7], [8, 8, 8, 8, 8, 8], [9, 9, 9, 9, 9, 9]]]), mindspore.float32)
>>> output = op(x)
>>> print(output)
[[[2.2833798e+33]]]
>>> print(output.shape)
(1, 1, 1)
>>> # case 2: Reduces a dimension along axis 0.
>>> output = op(x, 0)
>>> print(output)
[[[ 28.  28.  28.  28.  28.  28.]
[ 80.  80.  80.  80.  80.  80.]
[162. 162. 162. 162. 162. 162.]]]
>>> # case 3: Reduces a dimension along axis 1.
>>> output = op(x, 1)
>>> print(output)
[[[  6.   6.   6.   6.   6.   6.]]
[[120. 120. 120. 120. 120. 120.]]
[[504. 504. 504. 504. 504. 504.]]]
>>> # case 4: Reduces a dimension along axis 2.
>>> output = op(x, 2)
>>> print(output)
[[[1.00000e+00]
[6.40000e+01]
[7.29000e+02]]
[[4.09600e+03]
[1.56250e+04]
[4.66560e+04]]
[[1.17649e+05]
[2.62144e+05]
[5.31441e+05]]]