Merge master into realm-mlm

megatron/deprecated_data_utils/tokenization_gpt2.py

@@ -27,7 +27,8 @@ try:
     from functools import lru_cache
 except ImportError:
     # Just a dummy decorator to get the checks to run on python2
-    # because honestly I don't want to support a byte-level unicode BPE tokenizer on python 2 right now.
+    # because honestly I don't want to support a byte-level unicode BPE
+    # tokenizer on python 2 right now.
     def lru_cache():
         return lambda func: func
 
@@ -48,6 +49,7 @@ VOCAB_NAME = 'vocab.json'
 MERGES_NAME = 'merges.txt'
 SPECIAL_TOKENS_NAME = 'special_tokens.txt'
 
+
 @lru_cache()
 def bytes_to_unicode():
     """
@@ -60,17 +62,19 @@ def bytes_to_unicode():
     And avoids mapping to whitespace/control characters the bpe code barfs on.
     """
     _chr = unichr if sys.version_info[0] == 2 else chr
-    bs = list(range(ord("!"), ord("~")+1))+list(range(ord("¡"), ord("¬")+1))+list(range(ord("®"), ord("ÿ")+1))
+    bs = list(range(ord("!"), ord("~") + 1)) + list(range(ord("¡"), ord("¬") + 1)) + \
+        list(range(ord("®"), ord("ÿ") + 1))
     cs = bs[:]
     n = 0
     for b in range(2**8):
         if b not in bs:
             bs.append(b)
-            cs.append(2**8+n)
+            cs.append(2**8 + n)
             n += 1
     cs = [_chr(n) for n in cs]
     return dict(zip(bs, cs))
 
+
 def get_pairs(word):
     """Return set of symbol pairs in a word.
 
@@ -83,6 +87,7 @@ def get_pairs(word):
         prev_char = char
     return pairs
 
+
 class GPT2Tokenizer(object):
     """
     GPT-2 BPE tokenizer. Peculiarities:
@@ -138,23 +143,31 @@ class GPT2Tokenizer(object):
             special_tokens = open(special_tokens_file, encoding='utf-8').read().split('\n')[:-1]
         else:
             special_tokens = kwargs.pop('special_tokens', [])
-        tokenizer = cls(resolved_vocab_file, resolved_merges_file, special_tokens=special_tokens, *inputs, **kwargs)
+        tokenizer = cls(
+            resolved_vocab_file,
+            resolved_merges_file,
+            special_tokens=special_tokens,
+            *inputs,
+            **kwargs)
         return tokenizer
 
-    def __init__(self, vocab_file, merges_file, errors='replace', special_tokens=None, max_len=None):
+    def __init__(self, vocab_file, merges_file, errors='replace',
+                 special_tokens=None, max_len=None):
         self.max_len = max_len if max_len is not None else int(1e12)
         self.encoder = json.load(open(vocab_file))
-        self.decoder = {v:k for k,v in self.encoder.items()}
+        self.decoder = {v: k for k, v in self.encoder.items()}
         self.errors = errors  # how to handle errors in decoding
         self.byte_encoder = bytes_to_unicode()
-        self.byte_decoder = {v:k for k, v in self.byte_encoder.items()}
+        self.byte_decoder = {v: k for k, v in self.byte_encoder.items()}
         bpe_data = open(merges_file, encoding='utf-8').read().split('\n')[1:-1]
         bpe_merges = [tuple(merge.split()) for merge in bpe_data]
         self.bpe_ranks = dict(zip(bpe_merges, range(len(bpe_merges))))
         self.cache = {}
 
-        # Should haved added re.IGNORECASE so BPE merges can happen for capitalized versions of contractions
-        self.pat = re.compile(r"""'s|'t|'re|'ve|'m|'ll|'d| ?\p{L}+| ?\p{N}+| ?[^\s\p{L}\p{N}]+|\s+(?!\S)|\s+""")
+        # Should haved added re.IGNORECASE so BPE merges can happen for
+        # capitalized versions of contractions
+        self.pat = re.compile(
+            r"""'s|'t|'re|'ve|'m|'ll|'d| ?\p{L}+| ?\p{N}+| ?[^\s\p{L}\p{N}]+|\s+(?!\S)|\s+""")
 
         self.special_tokens = {}
         self.special_tokens_decoder = {}
@@ -172,8 +185,9 @@ class GPT2Tokenizer(object):
             self.special_tokens = {}
             self.special_tokens_decoder = {}
             return
-        self.special_tokens = dict((tok, len(self.encoder) + i) for i, tok in enumerate(special_tokens))
-        self.special_tokens_decoder = {v:k for k, v in self.special_tokens.items()}
+        self.special_tokens = dict((tok, len(self.encoder) + i)
+                                   for i, tok in enumerate(special_tokens))
+        self.special_tokens_decoder = {v: k for k, v in self.special_tokens.items()}
         logger.info("Special tokens {}".format(self.special_tokens))
 
     def bpe(self, token):
@@ -186,7 +200,7 @@ class GPT2Tokenizer(object):
             return token
 
         while True:
-            bigram = min(pairs, key = lambda pair: self.bpe_ranks.get(pair, float('inf')))
+            bigram = min(pairs, key=lambda pair: self.bpe_ranks.get(pair, float('inf')))
             if bigram not in self.bpe_ranks:
                 break
             first, second = bigram
@@ -197,12 +211,12 @@ class GPT2Tokenizer(object):
                     j = word.index(first, i)
                     new_word.extend(word[i:j])
                     i = j
-                except:
+                except BaseException:
                     new_word.extend(word[i:])
                     break
 
-                if word[i] == first and i < len(word)-1 and word[i+1] == second:
-                    new_word.append(first+second)
+                if word[i] == first and i < len(word) - 1 and word[i + 1] == second:
+                    new_word.append(first + second)
                     i += 2
                 else:
                     new_word.append(word[i])
@@ -245,7 +259,8 @@ class GPT2Tokenizer(object):
             logger.warning(
                 "Token indices sequence length is longer than the specified maximum "
                 " sequence length for this OpenAI GPT model ({} > {}). Running this"
-                " sequence through the model will result in indexing errors".format(len(ids), self.max_len)
+                " sequence through the model will result in indexing errors".format(
+                    len(ids), self.max_len)
             )
         return ids
 

megatron/deprecated_data_utils/wordpiece.py

@@ -123,7 +123,8 @@ class BertTokenizer(object):
             logger.warning(
                 "Token indices sequence length is longer than the specified maximum "
                 " sequence length for this BERT model ({} > {}). Running this"
-                " sequence through BERT will result in indexing errors".format(len(ids), self.max_len)
+                " sequence through BERT will result in indexing errors".format(
+                    len(ids), self.max_len)
             )
         return ids
 

megatron/fp16/__init__.py

 # coding=utf-8
-# Copyright (c) 2019, NVIDIA CORPORATION.  All rights reserved.
+# 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.

megatron/fp16/fp16.py

 # coding=utf-8
-# Copyright (c) 2019, NVIDIA CORPORATION.  All rights reserved.
+# 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.
@@ -22,12 +22,15 @@ from torch._utils import _flatten_dense_tensors, _unflatten_dense_tensors
 from .loss_scaler import DynamicLossScaler, LossScaler
 from .fp16util import model_grads_to_master_grads, master_params_to_model_params, clip_grad_norm
 
+from apex.multi_tensor_apply import multi_tensor_applier
+import amp_C
 
 from megatron.module import MegatronModule
 
 FLOAT_TYPES = (torch.FloatTensor, torch.cuda.FloatTensor)
 HALF_TYPES = (torch.HalfTensor, torch.cuda.HalfTensor)
 
+
 def conversion_helper(val, conversion):
     """Apply conversion to val. Recursively apply conversion if `val` is a nested tuple/list structure."""
     if not isinstance(val, (tuple, list)):
@@ -37,6 +40,7 @@ def conversion_helper(val, conversion):
         rtn = tuple(rtn)
     return rtn
 
+
 def fp32_to_fp16(val):
     """Convert fp32 `val` to fp16"""
     def half_conversion(val):
@@ -48,6 +52,7 @@ def fp32_to_fp16(val):
         return val
     return conversion_helper(val, half_conversion)
 
+
 def fp16_to_fp32(val):
     """Convert fp16 `val` to fp32"""
     def float_conversion(val):
@@ -59,6 +64,7 @@ def fp16_to_fp32(val):
         return val
     return conversion_helper(val, float_conversion)
 
+
 class FP16_Module(MegatronModule):
     def __init__(self, module):
         super(FP16_Module, self).__init__()
@@ -79,6 +85,8 @@ class FP16_Module(MegatronModule):
         self.module.load_state_dict(state_dict, strict=strict)
 
 # TODO:  Update overflow check + downscale to use Carl's fused kernel.
+
+
 class FP16_Optimizer(object):
     """
     :class:`FP16_Optimizer` is designed to wrap an existing PyTorch optimizer,
@@ -305,7 +313,8 @@ class FP16_Optimizer(object):
             master_params_to_model_params(fp32_from_fp16_group, fp16_group)
 
     # To consider:  Integrate distributed with this wrapper by registering a hook on each variable
-    # that does the overflow check, gradient copy + downscale, and fp32 allreduce in a different stream.
+    # that does the overflow check, gradient copy + downscale, and fp32
+    # allreduce in a different stream.
     def _model_grads_to_master_grads(self):
         for fp16_group, fp32_from_fp16_group in zip(self.fp16_groups, self.fp32_from_fp16_groups):
             model_grads_to_master_grads(fp16_group, fp32_from_fp16_group)
@@ -313,9 +322,12 @@ class FP16_Optimizer(object):
     def _downscale_master(self):
         if self.loss_scale != 1.0:
             for group in self.optimizer.param_groups:
-                for param in group['params']:
-                    if param.grad is not None:
-                        param.grad.data.mul_(1./self.loss_scale)
+                grads = [p.grad for p in group['params'] if p.grad is not None]
+                _overflow_buf = torch.cuda.IntTensor([0])
+                multi_tensor_applier(amp_C.multi_tensor_scale,
+                                     _overflow_buf,
+                                     [grads, grads],
+                                     1./self.loss_scale)
       
     def clip_master_grads(self, max_norm, norm_type=2):
         """
@@ -400,7 +412,8 @@ class FP16_Optimizer(object):
         # the current optimizer instance.  In our case, as long as the current FP16_Optimizer has been
         # constructed in the same way as the one whose state_dict we are loading, the same master params
         # are guaranteed to exist, so we can just copy_() from the saved master params.
-        for current_group, saved_group in zip(self.fp32_from_fp16_groups, state_dict['fp32_from_fp16']):
+        for current_group, saved_group in zip(
+                self.fp32_from_fp16_groups, state_dict['fp32_from_fp16']):
             for current, saved in zip(current_group, saved_group):
                 current.data.copy_(saved.data)
 
@@ -570,7 +583,8 @@ class FP16_Optimizer(object):
         """
         if self.dynamic_loss_scale:
             self._check_overflow()
-            if self.overflow: return
+            if self.overflow:
+                return
         self._model_grads_to_master_grads()
         self._downscale_master()
 
@@ -607,8 +621,8 @@ class FP16_Optimizer(object):
                 master_grads_data.append(master_grads_this_group)
             return master_grads_data
 
-
     # Promote loss scale so it can be retrieved or set via "fp16_optimizer_instance.loss_scale"
+
     def _get_loss_scale(self):
         return self.loss_scaler.loss_scale
 

megatron/fp16/fp16util.py

 # coding=utf-8
-# Copyright (c) 2019, NVIDIA CORPORATION.  All rights reserved.
+# 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.
@@ -18,6 +18,9 @@ import torch.nn as nn
 from torch.autograd import Variable
 from torch._utils import _flatten_dense_tensors, _unflatten_dense_tensors
 
+from apex.multi_tensor_apply import multi_tensor_applier
+import amp_C
+
 from megatron import mpu
 
 
@@ -102,6 +105,7 @@ class FP16Model(nn.Module):
 def backwards_debug_hook(grad):
     raise RuntimeError("master_params recieved a gradient in the backward pass!")
 
+
 def prep_param_lists(model, flat_master=False):
     """
     Creates a list of FP32 master parameters for a given model, as in
@@ -131,7 +135,7 @@ def prep_param_lists(model, flat_master=False):
             # flatten_dense_tensors returns a contiguous flat array.
             # http://pytorch.org/docs/master/_modules/torch/_utils.html
             master_params = _flatten_dense_tensors([param.data for param in model_params]).float()
-        except:
+        except BaseException:
             print("Error in prep_param_lists:  model may contain a mixture of parameters "
                   "of different types.  Use flat_master=False, or use F16_Optimizer.")
             raise
@@ -165,9 +169,15 @@ def model_grads_to_master_grads(model_params, master_params, flat_master=False):
             if model.grad is not None:
                 if master.grad is None:
                     master.grad = Variable(master.data.new(*master.data.size()))
-                master.grad.data.copy_(model.grad.data)
             else:
                 master.grad = None
+        model_grads = [p.grad for p in model_params if p.grad is not None]
+        master_grads = [p.grad for p in master_params if p.grad is not None]
+        _overflow_buf = torch.cuda.IntTensor([0])
+        multi_tensor_applier(amp_C.multi_tensor_scale,
+                             _overflow_buf,
+                             [model_grads, master_grads],
+                             1.0)
 
 
 def master_params_to_model_params(model_params, master_params, flat_master=False):
@@ -188,17 +198,19 @@ def master_params_to_model_params(model_params, master_params, flat_master=False
 
 # Backward compatibility fixes
 
+
 def to_python_float(t):
     if hasattr(t, 'item'):
         return t.item()
     else:
         return t[0]
 
+
 TORCH_MAJOR = int(torch.__version__.split('.')[0])
 TORCH_MINOR = int(torch.__version__.split('.')[1])
 
 clip_grad_norm = mpu.clip_grad_norm
-#elif TORCH_MAJOR == 0 and TORCH_MINOR <= 4:
+# elif TORCH_MAJOR == 0 and TORCH_MINOR <= 4:
 #    clip_grad_norm = torch.nn.utils.clip_grad_norm
-#else:
+# else:
 #    clip_grad_norm = torch.nn.utils.clip_grad_norm_

megatron/fp16/loss_scaler.py

 # coding=utf-8
-# Copyright (c) 2019, NVIDIA CORPORATION.  All rights reserved.
+# 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.
@@ -14,15 +14,22 @@
 # limitations under the License.
 
 import torch
+
+from apex.multi_tensor_apply import multi_tensor_applier
+import amp_C
+
 from megatron import mpu
 
 # item() is a recent addition, so this helps with backward compatibility.
+
+
 def to_python_float(t):
     if hasattr(t, 'item'):
         return t.item()
     else:
         return t[0]
 
+
 class LossScaler:
     """
     Class that manages a static loss scale.  This class is intended to interact with
@@ -54,12 +61,18 @@ class LossScaler:
         return self.cur_scale
 
     def scale_gradient(self, module, grad_in, grad_out):
-        return tuple(self.loss_scale * g for g in grad_in)
+        _overflow_buf = torch.cuda.IntTensor([0])
+        multi_tensor_applier(amp_C.multi_tensor_scale,
+                             _overflow_buf,
+                             [grad_in, grad_in],
+                             self.loss_scale)
+        return grad_in
 
     def backward(self, loss, retain_graph=False):
-        scaled_loss = loss*self.loss_scale
+        scaled_loss = loss * self.loss_scale
         scaled_loss.backward(retain_graph=retain_graph)
 
+
 class DynamicLossScaler:
     """
     Class that manages dynamic loss scaling.  It is recommended to use :class:`DynamicLossScaler`
@@ -122,8 +135,8 @@ class DynamicLossScaler:
         overflow = overflow_gpu[0].item()
         return bool(overflow)
 
-
     # `x` is a torch.Tensor
+
     def _has_inf_or_nan(x):
         try:
             # if x is half, the .float() incurs an additional deep copy, but it's necessary if
@@ -158,7 +171,7 @@ class DynamicLossScaler:
         if overflow:
             # self.cur_scale /= self.scale_factor
             if self.delayed_shift == 1 or self.cur_hysteresis == 1:
-                self.cur_scale = max(self.cur_scale/self.scale_factor, self.min_scale)
+                self.cur_scale = max(self.cur_scale / self.scale_factor, self.min_scale)
             else:
                 self.cur_hysteresis -= 1
             self.last_overflow_iter = self.cur_iter
@@ -176,12 +189,18 @@ class DynamicLossScaler:
         return self.cur_scale
 
     def scale_gradient(self, module, grad_in, grad_out):
-        return tuple(self.loss_scale * g for g in grad_in)
+        _overflow_buf = torch.cuda.IntTensor([0])
+        multi_tensor_applier(amp_C.multi_tensor_scale,
+                             _overflow_buf,
+                             [grad_in, grad_in],
+                             self.loss_scale)
+        return grad_in
 
     def backward(self, loss, retain_graph=False):
-        scaled_loss = loss*self.loss_scale
+        scaled_loss = loss * self.loss_scale
         scaled_loss.backward(retain_graph=retain_graph)
 
+
 ##############################################################
 # Example usage below here -- assuming it's in a separate file
 ##############################################################

megatron/global_vars.py

 # coding=utf-8
-# Copyright (c) 2019, NVIDIA CORPORATION.  All rights reserved.
+# 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.
@@ -61,22 +61,26 @@ def get_timers():
     return _GLOBAL_TIMERS
 
 
-def set_global_variables(extra_args_provider=None, args_defaults={}):
+def set_global_variables(extra_args_provider=None, args_defaults={},
+                         ignore_unknown_args=False):
     """Set args, tokenizer, tensorboard-writer, adlr-autoresume, and timers."""
     args = _parse_args(extra_args_provider=extra_args_provider,
-                       defaults=args_defaults)
+                       defaults=args_defaults,
+                       ignore_unknown_args=ignore_unknown_args)
     _ = _build_tokenizer(args)
     _set_tensorboard_writer(args)
     _set_adlr_autoresume(args)
     _set_timers()
 
 
-def _parse_args(extra_args_provider=None, defaults={}):
+def _parse_args(extra_args_provider=None, defaults={},
+                ignore_unknown_args=False):
     """Parse entire arguments."""
     global _GLOBAL_ARGS
     _ensure_var_is_not_initialized(_GLOBAL_ARGS, 'args')
     _GLOBAL_ARGS = parse_args(extra_args_provider=extra_args_provider,
-                              defaults=defaults)
+                              defaults=defaults,
+                              ignore_unknown_args=ignore_unknown_args)
     return _GLOBAL_ARGS
 
 
@@ -124,7 +128,7 @@ def _set_adlr_autoresume(args):
         sys.path.append(os.environ.get('SUBMIT_SCRIPTS', '.'))
         try:
             from userlib.auto_resume import AutoResume
-        except:
+        except BaseException:
             print('ADLR autoresume is not available, exiting ...')
             sys.exit()
 

megatron/initialize.py

 # coding=utf-8
-# Copyright (c) 2019, NVIDIA CORPORATION.  All rights reserved.
+# 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.
@@ -28,7 +28,8 @@ from megatron import mpu
 from megatron.global_vars import set_global_variables
 
 
-def initialize_megatron(extra_args_provider=None, args_defaults={}):
+def initialize_megatron(extra_args_provider=None, args_defaults={},
+                        ignore_unknown_args=False):
     """Set global variables, initialize distributed, and
     set autoresume and random seeds."""
     # Make sure cuda is available.
@@ -37,7 +38,8 @@ def initialize_megatron(extra_args_provider=None, args_defaults={}):
     # Parse args, build tokenizer, and set adlr-autoresume,
     # tensorboard-writer, and timers.
     set_global_variables(extra_args_provider=extra_args_provider,
-                         args_defaults=args_defaults)
+                         args_defaults=args_defaults,
+                         ignore_unknown_args=ignore_unknown_args)
 
     # Pytorch distributed.
     _initialize_distributed()

megatron/learning_rates.py

 # coding=utf-8
-# Copyright (c) 2019, NVIDIA CORPORATION.  All rights reserved.
+# 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.
@@ -48,7 +48,6 @@ class AnnealingLR(object):
 
         print_rank_0('> learning rate decay style: {}'.format(self.decay_style))
 
-
     def get_lr(self):
         """Learning rate decay functions from:
               https://openreview.net/pdf?id=BJYwwY9ll pg. 4"""
@@ -71,7 +70,6 @@ class AnnealingLR(object):
             lr = self.start_lr
         return max(lr, self.min_lr)
 
-
     def step(self, step_num=None):
         """Set lr for all parameters groups."""
         if step_num is None:
@@ -81,7 +79,6 @@ class AnnealingLR(object):
         for group in self.optimizer.param_groups:
             group['lr'] = new_lr
 
-
     def state_dict(self):
         state_dict = {
             'start_lr': self.start_lr,
@@ -93,7 +90,6 @@ class AnnealingLR(object):
         }
         return state_dict
 
-
     def _check_and_set(self, cls_value, sd_value, name):
         """Auxiliary function for checking the values in the checkpoint and
         setting them."""
@@ -108,7 +104,6 @@ class AnnealingLR(object):
                                                                   name))
         return sd_value
 
-
     def load_state_dict(self, sd):
 
         self.start_lr = self._check_and_set(self.start_lr, sd['start_lr'],

megatron/model/__init__.py

 # coding=utf-8
-# Copyright (c) 2019, NVIDIA CORPORATION.  All rights reserved.
+# 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.

megatron/model/bert_model.py

 # coding=utf-8
-# Copyright (c) 2019, NVIDIA CORPORATION.  All rights reserved.
+# 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.
@@ -22,16 +22,15 @@ import torch
 import torch.nn.functional as F
 
 from megatron import get_args
+from megatron.model.language_model import parallel_lm_logits
+from megatron.model.language_model import get_language_model
+from megatron.model.transformer import LayerNorm
+from megatron.model.utils import openai_gelu
+from megatron.model.utils import get_linear_layer
+from megatron.model.utils import init_method_normal
+from megatron.model.utils import scaled_init_method_normal
 from megatron.module import MegatronModule
 
-from .language_model import parallel_lm_logits
-from .language_model import get_language_model
-from .transformer import LayerNorm
-from .utils import gelu
-from .utils import get_linear_layer
-from .utils import init_method_normal
-from .utils import scaled_init_method_normal
-
 
 def bert_attention_mask_func(attention_scores, attention_mask):
     attention_scores = attention_scores + attention_mask
@@ -70,7 +69,6 @@ def bert_position_ids(token_ids):
     return position_ids
 
 
-
 class BertLMHead(MegatronModule):
     """Masked LM head for Bert
 
@@ -81,11 +79,14 @@ class BertLMHead(MegatronModule):
         layernorm_epsilon: tolerance for layer norm divisions
         parallel_output: whether output logits being distributed or not.
     """
+
     def __init__(self, mpu_vocab_size, hidden_size, init_method,
                  layernorm_epsilon, parallel_output):
 
         super(BertLMHead, self).__init__()
 
+        args = get_args()
+        
         self.bias = torch.nn.Parameter(torch.zeros(mpu_vocab_size))
         self.bias.model_parallel = True
         self.bias.partition_dim = 0
@@ -94,11 +95,13 @@ class BertLMHead(MegatronModule):
 
         self.dense = get_linear_layer(hidden_size, hidden_size, init_method)
         self.layernorm = LayerNorm(hidden_size, eps=layernorm_epsilon)
-
+        self.gelu = torch.nn.functional.gelu
+        if args.openai_gelu:
+            self.gelu = openai_gelu
 
     def forward(self, hidden_states, word_embeddings_weight):
         hidden_states = self.dense(hidden_states)
-        hidden_states = gelu(hidden_states)
+        hidden_states = self.gelu(hidden_states)
         hidden_states = self.layernorm(hidden_states)
         output = parallel_lm_logits(hidden_states,
                                     word_embeddings_weight,
@@ -107,7 +110,6 @@ class BertLMHead(MegatronModule):
         return output
 
 
-
 class BertModel(MegatronModule):
     """Bert Language model."""
 
@@ -184,7 +186,6 @@ class BertModel(MegatronModule):
 
         return lm_logits, None
 
-
     def state_dict_for_save_checkpoint(self, destination=None, prefix='',
                                        keep_vars=False):
         """For easy load when model is combined with other heads,
@@ -206,7 +207,6 @@ class BertModel(MegatronModule):
                 = self.ict_head.state_dict(destination, prefix, keep_vars)
         return state_dict_
 
-
     def load_state_dict(self, state_dict, strict=True):
         """Customized load."""
 
@@ -224,8 +224,6 @@ class BertModel(MegatronModule):
 
 
 class REALMBertModel(MegatronModule):
-
-    # TODO: load BertModel checkpoint
     def __init__(self, retriever):
         super(REALMBertModel, self).__init__()
         bert_args = dict(

megatron/model/classification.py

 # coding=utf-8
-# Copyright (c) 2019, NVIDIA CORPORATION.  All rights reserved.
+# 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.
@@ -53,7 +53,6 @@ class Classification(MegatronModule):
                                                     init_method)
         self._classification_head_key = 'classification_head'
 
-
     def forward(self, input_ids, attention_mask, tokentype_ids):
 
         extended_attention_mask = bert_extended_attention_mask(
@@ -74,7 +73,6 @@ class Classification(MegatronModule):
 
         return classification_logits
 
-
     def state_dict_for_save_checkpoint(self, destination=None, prefix='',
                                        keep_vars=False):
         """For easy load when model is combined with other heads,
@@ -89,7 +87,6 @@ class Classification(MegatronModule):
                 destination, prefix, keep_vars)
         return state_dict_
 
-
     def load_state_dict(self, state_dict, strict=True):
         """Customized load."""
 

megatron/model/distributed.py

 # coding=utf-8
-# Copyright (c) 2019, NVIDIA CORPORATION.  All rights reserved.
+# 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.
@@ -31,10 +31,6 @@ class DistributedDataParallel(MegatronModule):
 
         self.module = module
         self.data_parallel_group = mpu.get_data_parallel_group()
-        src_rank = mpu.get_model_parallel_rank()
-        for p in self.module.parameters():
-            if torch.is_tensor(p):
-                dist.broadcast(p, src_rank, group=self.data_parallel_group)
 
         def allreduce_params(reduce_after=True, no_scale=False, fp32_allreduce=False):
             if(self.needs_reduction):
@@ -71,8 +67,8 @@ class DistributedDataParallel(MegatronModule):
             def allreduce_hook(*unused):
                 Variable._execution_engine.queue_callback(allreduce_params)
         #    handle = param.register_hook(allreduce_hook)
-            #self.hooks.append(allreduce_hook)
-            #self.hook_handles.append(handle)
+            # self.hooks.append(allreduce_hook)
+            # self.hook_handles.append(handle)
         self.allreduce_params = allreduce_params
 
     def forward(self, *inputs, **kwargs):
@@ -114,4 +110,3 @@ class DistributedDataParallel(MegatronModule):
         super(DistributedDataParallel, self).train(mode)
         self.module.train(mode)
     '''
-

megatron/model/gpt2_model.py

 # coding=utf-8
-# Copyright (c) 2019, NVIDIA CORPORATION.  All rights reserved.
+# 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.
@@ -27,8 +27,7 @@ from .utils import scaled_init_method_normal
 
 
 def gpt2_attention_mask_func(attention_scores, ltor_mask):
-    attention_scores = torch.mul(attention_scores, ltor_mask) - \
-                       10000.0 * (1.0 - ltor_mask)
+    attention_scores.masked_fill_(ltor_mask, -10000.0)
     return attention_scores
 
 
@@ -49,7 +48,6 @@ class GPT2Model(MegatronModule):
             scaled_init_method=scaled_init_method_normal(args.init_method_std,
                                                          args.num_layers))
 
-
     def forward(self, input_ids, position_ids, attention_mask,
                 tokentype_ids=None, layer_past=None, get_key_value=False,
                 forward_method_parallel_output=None):
@@ -79,7 +77,6 @@ class GPT2Model(MegatronModule):
 
         return output
 
-
     def state_dict_for_save_checkpoint(self, destination=None, prefix='',
                                        keep_vars=False):
 
@@ -89,7 +86,6 @@ class GPT2Model(MegatronModule):
                 destination, prefix, keep_vars)
         return state_dict_
 
-
     def load_state_dict(self, state_dict, strict=True):
         """Customized load."""
 

megatron/model/language_model.py

 # coding=utf-8
-# Copyright (c) 2019, NVIDIA CORPORATION.  All rights reserved.
+# 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.
@@ -21,9 +21,8 @@ import torch.nn.functional as F
 from megatron import get_args
 from megatron import mpu
 from megatron.module import MegatronModule
-
 from megatron.model.transformer import ParallelTransformer
-from megatron.model.utils import gelu
+from megatron.model.utils import openai_gelu
 from megatron.model.utils import get_linear_layer
 
 
@@ -47,6 +46,12 @@ def parallel_lm_logits(input_, word_embeddings_weight, parallel_output,
 def get_language_model(attention_mask_func, num_tokentypes, add_pooler,
                        init_method, scaled_init_method, max_pos_embeds=None):
     """Build language model and return along with the key to save."""
+    args = get_args()
+
+    # Use torch gelu unless otherwise forced.
+    gelu = F.gelu
+    if args.openai_gelu:
+        gelu = openai_gelu
     
     # Language model.
     language_model = TransformerLanguageModel(
@@ -63,7 +68,6 @@ def get_language_model(attention_mask_func, num_tokentypes, add_pooler,
     return language_model, language_model_key
 
 
-
 class Pooler(MegatronModule):
     """Pooler layer.
 
@@ -75,11 +79,11 @@ class Pooler(MegatronModule):
         init_method: weight initialization method for the linear layer.
             bias is set to zero.
     """
+
     def __init__(self, hidden_size, init_method):
         super(Pooler, self).__init__()
         self.dense = get_linear_layer(hidden_size, hidden_size, init_method)
 
-
     def forward(self, hidden_states, sequence_index=0):
         # hidden_states: [b, s, h]
         # sequence_index: index of the token to pool.
@@ -102,6 +106,7 @@ class Embedding(MegatronModule):
         num_tokentypes: size of the token-type embeddings. 0 value
                         will ignore this embedding
     """
+
     def __init__(self,
                  hidden_size,
                  vocab_size,
@@ -143,7 +148,6 @@ class Embedding(MegatronModule):
         # Embeddings dropout
         self.embedding_dropout = torch.nn.Dropout(embedding_dropout_prob)
 
-
     def add_tokentype_embeddings(self, num_tokentypes):
         """Add token-type embedding. This function is provided so we can add
         token-type embeddings in case the pretrained model does not have it.
@@ -160,7 +164,6 @@ class Embedding(MegatronModule):
         # Initialize the token-type embeddings.
         self.init_method(self.tokentype_embeddings.weight)
 
-
     def forward(self, input_ids, position_ids, tokentype_ids=None):
         # Embeddings.
         words_embeddings = self.word_embeddings(input_ids)
@@ -177,7 +180,6 @@ class Embedding(MegatronModule):
 
         return embeddings
 
-
     def state_dict_for_save_checkpoint(self, destination=None, prefix='',
                                        keep_vars=False):
         """For easy load."""
@@ -195,7 +197,6 @@ class Embedding(MegatronModule):
 
         return state_dict_
 
-
     def load_state_dict(self, state_dict, strict=True):
         """Customized load."""
 
@@ -242,7 +243,6 @@ class Embedding(MegatronModule):
                       'checkpoint but could not find it', flush=True)
 
 
-
 class TransformerLanguageModel(MegatronModule):
     """Transformer language model.
 
@@ -261,6 +261,7 @@ class TransformerLanguageModel(MegatronModule):
         num_tokentypes: size of the token-type embeddings. 0 value
                         will ignore this embedding
     """
+
     def __init__(self,
                  attention_mask_func,
                  mlp_activation_func,
@@ -298,7 +299,6 @@ class TransformerLanguageModel(MegatronModule):
             self.pooler = Pooler(self.hidden_size, self.init_method)
             self._pooler_key = 'pooler'
 
-
     def forward(self, input_ids, position_ids, attention_mask,
                 tokentype_ids=None, layer_past=None, get_key_value=False,
                 pooling_sequence_index=0):
@@ -320,7 +320,6 @@ class TransformerLanguageModel(MegatronModule):
 
         return transformer_output
 
-
     def state_dict_for_save_checkpoint(self, destination=None, prefix='',
                                        keep_vars=False):
         """For easy load."""
@@ -339,7 +338,6 @@ class TransformerLanguageModel(MegatronModule):
 
         return state_dict_
 
-
     def load_state_dict(self, state_dict, strict=True):
         """Customized load."""
 

megatron/model/multiple_choice.py

 # coding=utf-8
-# Copyright (c) 2019, NVIDIA CORPORATION.  All rights reserved.
+# 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.
@@ -51,7 +51,6 @@ class MultipleChoice(MegatronModule):
                                                  init_method)
         self._multichoice_head_key = 'multichoice_head'
 
-
     def forward(self, input_ids, attention_mask, tokentype_ids):
 
         # [batch, choices, sequence] --> [batch * choices, sequence] -->
@@ -86,7 +85,6 @@ class MultipleChoice(MegatronModule):
 
         return multichoice_logits
 
-
     def state_dict_for_save_checkpoint(self, destination=None, prefix='',
                                        keep_vars=False):
         """For easy load when model is combined with other heads,
@@ -101,7 +99,6 @@ class MultipleChoice(MegatronModule):
                 destination, prefix, keep_vars)
         return state_dict_
 
-
     def load_state_dict(self, state_dict, strict=True):
         """Customized load."""
 

megatron/model/transformer.py

 # coding=utf-8
-# Copyright (c) 2019, NVIDIA CORPORATION.  All rights reserved.
+# 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.
@@ -46,6 +46,7 @@ from megatron.module import MegatronModule
                                      unmaksed-attention-scores, attention-mask)
 """
 
+
 class ParallelMLP(MegatronModule):
     """MLP.
 
@@ -63,7 +64,7 @@ class ParallelMLP(MegatronModule):
         # Project to 4h.
         self.dense_h_to_4h = mpu.ColumnParallelLinear(
             args.hidden_size,
-            4*args.hidden_size,
+            4 * args.hidden_size,
             gather_output=False,
             init_method=init_method)
 
@@ -71,14 +72,13 @@ class ParallelMLP(MegatronModule):
 
         # Project back to h.
         self.dense_4h_to_h = mpu.RowParallelLinear(
-            4*args.hidden_size,
+            4 * args.hidden_size,
             args.hidden_size,
             input_is_parallel=True,
             init_method=output_layer_init_method)
 
         self.dropout = torch.nn.Dropout(args.hidden_dropout)
 
-
     def forward(self, hidden_states):
 
         # [b, s, 4hp]
@@ -91,13 +91,13 @@ class ParallelMLP(MegatronModule):
         return output
 
 
-
 class ParallelSelfAttention(MegatronModule):
     """Parallel self-attention layer abstract class.
 
     Self-attention layer takes input with size [b, s, h]
     and returns output of the same size.
     """
+
     def __init__(self, attention_mask_func, init_method,
                  output_layer_init_method, layer_number):
         super(ParallelSelfAttention, self).__init__()
@@ -123,7 +123,7 @@ class ParallelSelfAttention(MegatronModule):
         # Strided linear layer.
         self.query_key_value = mpu.ColumnParallelLinear(
             args.hidden_size,
-            3*args.hidden_size,
+            3 * args.hidden_size,
             stride=3,
             gather_output=False,
             init_method=init_method)
@@ -141,7 +141,6 @@ class ParallelSelfAttention(MegatronModule):
             init_method=output_layer_init_method)
         self.output_dropout = torch.nn.Dropout(args.hidden_dropout)
 
-
     def _transpose_for_scores(self, tensor):
         """Transpose a 3D tensor [b, s, np*hn] into a 4D tensor with
         size [b, np, s, hn].
@@ -152,7 +151,6 @@ class ParallelSelfAttention(MegatronModule):
         tensor = tensor.view(*new_tensor_shape)
         return tensor.permute(0, 2, 1, 3)
 
-
     def _get_query_key_value(self, hidden_states):
         """Get query, key, and value and transpose to
         get size [b, np, s, hn].
@@ -170,7 +168,6 @@ class ParallelSelfAttention(MegatronModule):
 
         return query_layer, key_layer, value_layer
 
-
     def _get_unmasked_attention_scores(self, query_layer, key_layer):
         """Unmasked attention scores with size [b, np, s, s]."""
         coeff = 1
@@ -179,9 +176,8 @@ class ParallelSelfAttention(MegatronModule):
         norm_factor = math.sqrt(coeff *
                                 math.sqrt(self.hidden_size_per_attention_head))
         # Raw attention scores. [b, np, s, s]
-        return torch.matmul(query_layer/norm_factor,
-                            key_layer.transpose(-1, -2)/norm_factor)
-
+        return torch.matmul(query_layer / norm_factor,
+                            key_layer.transpose(-1, -2) / norm_factor)
 
     def _get_attention_probs(self, attention_scores):
         """Attention probabilies with dropout. The output has
@@ -198,7 +194,6 @@ class ParallelSelfAttention(MegatronModule):
 
         return attention_probs
 
-
     def _get_attended_context(self, attention_probs, value_layer):
         """Final attended tesnor and transposed back to [b, s, hp]."""
         # Context layer.
@@ -213,7 +208,6 @@ class ParallelSelfAttention(MegatronModule):
 
         return context_layer
 
-
     def _get_output(self, context_layer):
         """Output layer with dropout."""
         # Output. [b, s, h]
@@ -222,7 +216,6 @@ class ParallelSelfAttention(MegatronModule):
 
         return output
 
-
     def forward(self, hidden_states, attention_mask, layer_past=None,
                 get_key_value=False):
         # hidden_states: [b, s, h]
@@ -254,7 +247,7 @@ class ParallelSelfAttention(MegatronModule):
                 if layer_past is not None:
                     attention_mask = attention_mask[
                         ...,
-                        attention_scores.size(3)-1,
+                        attention_scores.size(3) - 1,
                         :attention_scores.size(3)].unsqueeze(2)
                 else:
                     attention_mask = attention_mask[
@@ -283,13 +276,13 @@ class ParallelSelfAttention(MegatronModule):
         return output
 
 
-
 class ParallelTransformerLayer(MegatronModule):
     """A single transformer layer.
 
     Transformore layer takes input with size [b, s, h] and returns an
     output of the same size.
     """
+
     def __init__(self, attention_mask_func, mlp_activation_func,
                  init_method, output_layer_init_method, layer_number):
         args = get_args()
@@ -319,7 +312,6 @@ class ParallelTransformerLayer(MegatronModule):
         self.mlp = ParallelMLP(mlp_activation_func, init_method,
                                output_layer_init_method)
 
-
     def forward(self, hidden_states, attention_mask, layer_past=None,
                 get_key_value=False):
         # hidden_states: [b, s, h]
@@ -375,14 +367,13 @@ class ParallelTransformer(MegatronModule):
 
         # Transformer layers.
         self.layers = torch.nn.ModuleList(
-            [get_layer(i+1) for i in range(args.num_layers)])
+            [get_layer(i + 1) for i in range(args.num_layers)])
 
         # Final layer norm before output.
         self.final_layernorm = LayerNorm(
             args.hidden_size,
             eps=args.layernorm_epsilon)
 
-
     def _checkpointed_forward(self, hidden_states, attention_mask):
         """Forward method with activation checkpointing."""
         def custom(start, end):
@@ -398,13 +389,12 @@ class ParallelTransformer(MegatronModule):
         num_layers = len(self.layers)
         while l < num_layers:
             hidden_states = mpu.checkpoint(
-                custom(l, l+self.checkpoint_num_layers),
+                custom(l, l + self.checkpoint_num_layers),
                 hidden_states, attention_mask)
             l += self.checkpoint_num_layers
 
         return hidden_states
 
-
     def forward(self, hidden_states, attention_mask, layer_past=None,
                 get_key_value=False):
 

megatron/model/utils.py

 # coding=utf-8
-# Copyright (c) 2019, NVIDIA CORPORATION.  All rights reserved.
+# 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.
@@ -33,6 +33,7 @@ def init_method_normal(sigma):
 def scaled_init_method_normal(sigma, num_layers):
     """Init method based on N(0, sigma/sqrt(2*num_layers)."""
     std = sigma / math.sqrt(2.0 * num_layers)
+
     def init_(tensor):
         return torch.nn.init.normal_(tensor, mean=0.0, std=std)
 
@@ -53,8 +54,7 @@ def gelu_impl(x):
     """OpenAI's gelu implementation."""
     return 0.5 * x * (1.0 + torch.tanh(0.7978845608028654 * x *
                                        (1.0 + 0.044715 * x * x)))
-
-def gelu(x):
+def openai_gelu(x):
     return gelu_impl(x)
 
 

megatron/module.py

 # coding=utf-8
-# Copyright (c) 2019, NVIDIA CORPORATION.  All rights reserved.
+# 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.
@@ -21,11 +21,9 @@ import torch
 class MegatronModule(torch.nn.Module):
     """Megatron specific extentions of torch Module."""
 
-
     def __init__(self):
         super(MegatronModule, self).__init__()
 
-
     def state_dict_for_save_checkpoint(self, destination=None, prefix='',
                                        keep_vars=False):
         """Use this function to override the state dict for