Support non-floating point operations in compute_flops for AutoTVM #2776
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Closes #2628.
This is a simple modification that does two things:
a) Extends the unit tests in test_autotvm_flop_calculator to randomly sample various datatypes.
b) Modifies compute_flop to stop counting flops from indexing expressions (i.e.
X[a, 4 * b, 5 * c]does not count as an operation, which is inline with expectations), and unconditionally accumulate flops from mathematical expressions (x * y + z, etc) without checking the datatype (which is what we expect for non-floating point operations).The tests now pass for all cases, which is what we expect.