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Load function that computes the byte size of a single-output Operation.

This is intended to be used with "Variable" ops, which have a single Tensor output with the contents of the variable. However, it can also be used for calculating the size of any op that has a single output.

Intended to be used with GreedyLoadBalancingStrategy.

op An Operation with a single output, typically a "Variable" op.

The number of bytes in the output Tensor.

ValueError if op does not have a single output, or if the shape of the single output is not fully-defined.