[Numpy-discussion] Precompute shape of ufunc output.

[drtodd13]

If I want to provide the "out" kwarg to, for example, a reduce ufunc then I
need to know the shape of the output given the other set of inputs.  Is
there a utility function to take these arguments and just compute what the
shape of the output is going to be without actually computing the result? 
Would be nice if there were a standard kwarg for many functions that just
tells you the shape of the output without actually computing it but I don't
think that exists.  Any ideas appreciated.  Thanks.



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