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mindspore.ops.ReduceMean

class mindspore.ops.ReduceMean(*args, **kwargs)

Reduces a dimension of a tensor by averaging all elements in the dimension.

The dtype of the tensor to be reduced is number.

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)]) - The dimensions to reduce. Default: (), reduce all dimensions. Only constant value is allowed. Must be in the range [-rank(x), rank(x)).

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 mean of all elements in the input tensor.

• If axis is int, set as 2, and keep_dims is False, the shape of output is $(x_1,x_3,...,x_R)$.

• If axis is tuple(int), set as (2, 3), and keep_dims is False, the shape of output is $(x_1,x_4,...,x_R)$.

Raises

• TypeError – If keep_dims is not a bool.

• TypeError – If x is not a Tensor.

• ValueError – If axis is not one of the following: int, tuple or list.

Supported Platforms:

Ascend GPU CPU

Examples

>>> x = Tensor(np.random.randn(3, 4, 5, 6).astype(np.float32))
>>> op = ops.ReduceMean(keep_dims=True)
>>> output = op(x, 1)
>>> result = output.shape
>>> print(result)
(3, 1, 5, 6)
>>> 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)
>>> op = ops.ReduceMean(keep_dims=True)
>>> output = op(x, 0)
>>> print(output)
[[[4. 4. 4. 4. 4. 4.]
  [5. 5. 5. 5. 5. 5.]
  [6. 6. 6. 6. 6. 6.]]]
>>> output = op(x, 1)
>>> print(output)
[[[2. 2. 2. 2. 2. 2.]]
 [[5. 5. 5. 5. 5. 5.]]
 [[8. 8. 8. 8. 8. 8.]]]
>>> output = op(x, 2)
>>> print(output)
[[[1.       ]
  [2.       ]
  [3.       ]]
 [[4.       ]
  [5.       ]
  [6.       ]]
 [[7.0000005]
  [8.       ]
  [9.       ]]]