update layernorm (#1570)
* port layernorm * change warp_welford.hpp * Update warpshuffle * 1. Add save mean and save std back 2. Move construction of tensor_view and tile_window to operator() * refine welford max count calculation * unify layernorm api * Rename file * Remove save mean and inv std * Revert "refine welford max count calculation" This reverts commit 02236580. * Fix order of parameter * refine welford max count calculation again * Remove fp32 instances * Fix bug of padding * refactor api * Support bf16 * Extract common function * Refine arg of operator() * Add kMThreadPerBlock to template parameter * clang format * Refine variable name * Refine file name * remove redundant line * refactor layernorm2d pipeline and add block-per-block utility * fix name * rename more * add more block-per-tile instance * remove duplicated define * update instance for 2048, 1024 case * support u...
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