tf.keras.backend.var( x, axis=None, keepdims=False )
Variance of a tensor, alongside the specified axis.
x: A tensor or variable.
axis: An integer, the axis to compute the variance.
keepdims: A boolean, whether to keep the dimensions or not. If
False, the rank of the tensor is reduced by 1. If
True, the reduced dimension is retained with length 1.
A tensor with the variance of elements of
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