class mindspore.ops.ExpandDims[source]

Adds an additional dimension to input_x at the given axis.


If the specified axis is a negative number, the index is counted backward from the end and starts at 1.

  • input_x (Tensor) - The shape of tensor is \((x_1, x_2, ..., x_R)\).

  • axis (int) - Specifies the dimension index at which to expand the shape of input_x. The value of axis must be in the range [-input_x.ndim-1, input_x.ndim]. Only constant value is allowed.


Tensor, the shape of tensor is \((1, x_1, x_2, ..., x_R)\) if the value of axis is 0. It has the same data type as input_x.


ValueError – If axis is not an int or not in the valid range.

Supported Platforms:

Ascend GPU CPU


>>> input_tensor = Tensor(np.array([[2, 2], [2, 2]]), mindspore.float32)
>>> expand_dims = ops.ExpandDims()
>>> output = expand_dims(input_tensor, 0)
>>> print(output)
[[[2. 2.]
  [2. 2.]]]