Fix doc

[ENH,REGRESSION FIX] Fix regression that introduce extra node related to infer shape

[WIP] CpuCorrMM closes #3026 - redux

New conv2d interface (work in progress)

TH-2695 Accept symbolic `reps` in `tensor.tile`

Scan inplace opt

changing `assert` to `AssertionError`

This `assert` statement does not provide any error message making debugging this case hard. Moreover, `assert` is eliminated when using optimized python code (https://docs.python.org/2.7/reference/simple_stmts.html#the-assert-statement), introducing a potential bug into the system. Explicitly checking and raising an AssertionError will prevent this from happening.

Scan replace Allocs with AllocEmpty

Mixed: crash fix, doc, doc memory/speed trade-off, fix tests

Crash gpu and opt speed up