[TOPI] Expose the interface of topi.collapse_sum
#102
Merged
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TOPI has an implementation of
collapse_sum
internally (tvm/topi/reduction.h
) but it is not exposed to FFI and can not be called in Python side. This patch exposes it and adds some related tests.Besides, now legalizer can legalize
collapse_sum_like/to
! But due to the TOPI implementation, it can't handle the symbolic case.