a : array_like
Array containing numbers whose variance is desired. If a is not an array, a conversion is attempted.
axis : None or int or tuple of ints, optional
Axis or axes along which the variance is computed. The default is to compute the variance of the flattened array.
New in version 1.7.0.
If this is a tuple of ints, a variance is performed over multiple axes, instead of a single axis or all the axes as before.
dtype : data-type, optional
Type to use in computing the variance. For arrays of integer type the default is
float32; for arrays of float types it is the same as the array type.
out : ndarray, optional
Alternate output array in which to place the result. It must have the same shape as the expected output, but the type is cast if necessary.
ddof : int, optional
“Delta Degrees of Freedom”: the divisor used in the calculation is
N - ddof, whereNrepresents the number of elements. By default ddof is zero.
keepdims : bool, optional
If this is set to True, the axes which are reduced are left in the result as dimensions with size one. With this option, the result will broadcast correctly against the input array.
If the default value is passed, then keepdims will not be passed through to the
varmethod of sub-classes ofndarray, however any non-default value will be. If the sub-classessummethod does not implement keepdims any exceptions will be raised.
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