Function reduce_logsumexp

Computes log(sum(exp(elements across dimensions of a tensor))). Reduces `input_tensor` along the dimensions given in `axis`. Unless `keep_dims` is true, the rank of the tensor is reduced by 1 for each entry in `axis`. If `keep_dims` is true, the reduced dimensions are retained with length 1

(input_tensor,
                     axis=None,
                     keep_dims=False,
                     name=None,
                     reduction_indices=None)