Axis along which to compute the minimum.
By default (axis=None), find the minimum value in all the
dimensions of the input array.
keepdims
If True, axes which are reduced are left in the result as
dimensions that are broadcast to the size of the original
input tensor. Defaults to False.
Returns
An array with the minimum value. If axis=None, the result is a scalar
value representing the minimum element in the entire array. If axis is
given, the result is an array with the minimum values along
the specified axis.