| # coding=utf-8 | |
| # Copyright (c) 2020, NVIDIA CORPORATION. All rights reserved. | |
| # | |
| # Licensed under the Apache License, Version 2.0 (the "License"); | |
| # you may not use this file except in compliance with the License. | |
| # You may obtain a copy of the License at | |
| # | |
| # http://www.apache.org/licenses/LICENSE-2.0 | |
| # | |
| # Unless required by applicable law or agreed to in writing, software | |
| # distributed under the License is distributed on an "AS IS" BASIS, | |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| # See the License for the specific language governing permissions and | |
| # limitations under the License. | |
| try: | |
| from apex.normalization.fused_layer_norm import MixedFusedLayerNorm | |
| from apex.transformer.layers.layer_norm import FastLayerNorm | |
| HAVE_APEX = True | |
| except (ImportError, ModuleNotFoundError): | |
| HAVE_APEX = False | |
| def get_layer_norm(hidden_size, eps=1e-5, persist_layer_norm=False, sequence_parallel=False): | |
| # List of hiddens sizes supported in the persistent layer norm kernel | |
| # If the hidden size is not supported, fall back to the non-persistent | |
| # kernel. | |
| persist_ln_hidden_sizes = [ | |
| 1024, | |
| 1536, | |
| 2048, | |
| 2304, | |
| 3072, | |
| 3840, | |
| 4096, | |
| 5120, | |
| 6144, | |
| 8192, | |
| 10240, | |
| 12288, | |
| 12800, | |
| 15360, | |
| 16384, | |
| 18432, | |
| 20480, | |
| 24576, | |
| 25600, | |
| 30720, | |
| 32768, | |
| 40960, | |
| 49152, | |
| 65536, | |
| ] | |
| if hidden_size not in persist_ln_hidden_sizes: | |
| persist_layer_norm = False | |
| if persist_layer_norm: | |
| return FastLayerNorm(hidden_size, eps, sequence_parallel_enabled=sequence_parallel) | |
| else: | |
| return MixedFusedLayerNorm(hidden_size, eps, sequence_parallel_enbaled=sequence_parallel) | |