WIP examples

examples/run_glue.py

@@ -37,7 +37,7 @@ from pytorch_transformers import (BertForSequenceClassification, XLNetForSequenc
                                   XLNET_PRETRAINED_MODEL_ARCHIVE_MAP, XLM_PRETRAINED_MODEL_ARCHIVE_MAP)
 from pytorch_transformers import (BertTokenizer, XLNetTokenizer,
                                   XLMTokenizer)
-from pytorch_transformers.optimization import BertAdam, WarmupLinearSchedule
+from pytorch_transformers.optimization import BertAdam
 
 from utils_glue import processors, output_modes, convert_examples_to_features, compute_metrics
 
@@ -60,12 +60,12 @@ TOKENIZER_CLASSES = {
     'xlm': XLMTokenizer,
 }
 
-def train(args, train_dataset, model):
+def train(args, train_dataset, model, tokenizer):
     """ Train the model """
     if args.local_rank in [-1, 0]:
         tb_writer = SummaryWriter()
 
-    args.train_batch_size = args.train_batch_size // args.gradient_accumulation_steps
+    args.train_batch_size = args.per_gpu_train_batch_size * args.n_gpu
     train_sampler = RandomSampler(train_dataset) if args.local_rank == -1 else DistributedSampler(train_dataset)
     train_dataloader = DataLoader(train_dataset, sampler=train_sampler, batch_size=args.train_batch_size)
 
@@ -76,42 +76,36 @@ def train(args, train_dataset, model):
         num_train_optimization_steps = len(train_dataloader) // args.gradient_accumulation_steps * args.num_train_epochs
 
     # Prepare optimizer
-    param_optimizer = list(model.named_parameters())
-    no_decay = ['bias', 'LayerNorm.bias', 'LayerNorm.weight']
+    no_decay = ['bias', 'LayerNorm.weight']
     optimizer_grouped_parameters = [
-        {'params': [p for n, p in param_optimizer if not any(nd in n for nd in no_decay)], 'weight_decay': 0.01},
-        {'params': [p for n, p in param_optimizer if any(nd in n for nd in no_decay)], 'weight_decay': 0.0}
+        {'params': [p for n, p in model.named_parameters() if not any(nd in n for nd in no_decay)], 'weight_decay': args.weight_decay},
+        {'params': [p for n, p in model.named_parameters() if any(nd in n for nd in no_decay)], 'weight_decay': 0.0}
         ]
+    optimizer = BertAdam(optimizer_grouped_parameters, lr=args.learning_rate,
+                         t_total=num_train_optimization_steps, warmup=args.warmup_proportion)
     if args.fp16:
         try:
-            from apex.optimizers import FP16_Optimizer, FusedAdam
+            from apex import amp
         except ImportError:
             raise ImportError("Please install apex from https://www.github.com/nvidia/apex to use fp16 training.")
-        optimizer = FusedAdam(optimizer_grouped_parameters, lr=args.learning_rate, bias_correction=False, max_grad_norm=1.0)
-        if args.loss_scale == 0:
-            optimizer = FP16_Optimizer(optimizer, dynamic_loss_scale=True)
-        else:
-            optimizer = FP16_Optimizer(optimizer, static_loss_scale=args.loss_scale)
-        warmup_linear = WarmupLinearSchedule(warmup=args.warmup_proportion, t_total=num_train_optimization_steps)
-
-    else:
-        optimizer = BertAdam(optimizer_grouped_parameters, lr=args.learning_rate, warmup=args.warmup_proportion,
-                             t_total=num_train_optimization_steps)
+        model, optimizer = amp.initialize(model, optimizer, opt_level=args.fp16_opt_level)
 
     # Train!
     logger.info("***** Running training *****")
     logger.info("  Num examples = %d", len(train_dataset))
     logger.info("  Num Epochs = %d", args.num_train_epochs)
-    logger.info("  Batch size = %d", args.train_batch_size)
+    logger.info("  Instantaneous batch size per GPU = %d", args.per_gpu_train_batch_size)
+    logger.info("  Total train batch size (w. parallel, distributed & accumulation) = %d",
+                   args.train_batch_size * args.gradient_accumulation_steps * (torch.distributed.get_world_size() if args.local_rank != -1 else 1))
     logger.info("  Gradient Accumulation steps = %d", args.gradient_accumulation_steps)
     logger.info("  Total optimization steps = %d", num_train_optimization_steps)
 
     global_step = 0
-    tr_loss = 0
-    model.train()
+    tr_loss, logging_loss = 0.0, 0.0
     optimizer.zero_grad()
     for _ in trange(int(args.num_train_epochs), desc="Epoch", disable=args.local_rank not in [-1, 0]):
         for step, batch in enumerate(tqdm(train_dataloader, desc="Iteration", disable=args.local_rank not in [-1, 0])):
+            model.train()
             batch = tuple(t.to(args.device) for t in batch)
             inputs = {'input_ids':      batch[0],
                       'attention_mask': batch[1],
@@ -125,23 +119,25 @@ def train(args, train_dataset, model):
             if args.gradient_accumulation_steps > 1:
                 loss = loss / args.gradient_accumulation_steps
 
-            loss.backward() if not args.fp16 else optimizer.backward(loss)
+            if args.fp16:
+                with amp.scale_loss(loss, optimizer) as scaled_loss:
+                    scaled_loss.backward()
+            else:
+                loss.backward()
 
             tr_loss += loss.item()
             if (step + 1) % args.gradient_accumulation_steps == 0:
-                if args.fp16:
-                    # modify learning rate with special warm up BERT uses
-                    # if args.fp16 is False, BertAdam is used that handles this automatically
-                    lr_this_step = args.learning_rate * warmup_linear.get_lr(global_step, args.warmup_proportion)
-                    for param_group in optimizer.param_groups:
-                        param_group['lr'] = lr_this_step
                 optimizer.step()
                 optimizer.zero_grad()
                 global_step += 1
-                if args.local_rank in [-1, 0]:
-                    if not args.fp16:
+                if args.local_rank in [-1, 0] and args.logging_steps > 0 and global_step % args.logging_steps == 0:
+                    if args.local_rank == -1:  # Only evaluate on single GPU otherwise metrics may not average well
+                        results = evaluate(args, model, tokenizer)
+                        for key, value in results.items():
+                            tb_writer.add_scalar('eval_{}'.format(key), value, global_step)
                     tb_writer.add_scalar('lr', optimizer.get_lr()[0], global_step)
-                    tb_writer.add_scalar('loss', loss.item(), global_step)
+                    tb_writer.add_scalar('loss', (tr_loss - logging_loss)/args.logging_steps, global_step)
+                    logging_loss = tr_loss
             if args.max_steps > 0 and global_step > args.max_steps:
                 break
         if args.max_steps > 0 and global_step > args.max_steps:
@@ -150,18 +146,26 @@ def train(args, train_dataset, model):
     return global_step, tr_loss / global_step
 
 
-def evalutate(args, eval_task, eval_output_dir, dataset, model):
+def evaluate(args, model, tokenizer):
+    # Loop to handle MNLI double evaluation (matched, mis-matched)
+    eval_task_names = ("mnli", "mnli-mm") if args.task_name == "mnli" else (args.task_name,)
+    eval_outputs_dirs = (args.output_dir, args.output_dir + '-MM') if args.task_name == "mnli" else (args.output_dir,)
+
+    results = {}
+    for eval_task, eval_output_dir in zip(eval_task_names, eval_outputs_dirs):
+        eval_dataset = load_and_cache_examples(args, eval_task, tokenizer, evaluate=True)
+
         """ Evaluate the model """
         if not os.path.exists(eval_output_dir) and args.local_rank in [-1, 0]:
             os.makedirs(eval_output_dir)
 
         # Note that DistributedSampler samples randomly
-    eval_sampler = SequentialSampler(dataset) if args.local_rank == -1 else DistributedSampler(dataset)
-    eval_dataloader = DataLoader(dataset, sampler=eval_sampler, batch_size=args.eval_batch_size)
+        eval_sampler = SequentialSampler(eval_dataset) if args.local_rank == -1 else DistributedSampler(eval_dataset)
+        eval_dataloader = DataLoader(eval_dataset, sampler=eval_sampler, batch_size=args.eval_batch_size)
 
         # Eval!
         logger.info("***** Running evaluation *****")
-    logger.info("  Num examples = %d", len(dataset))
+        logger.info("  Num examples = %d", len(eval_dataset))
         logger.info("  Batch size = %d", args.eval_batch_size)
         model.eval()
         eval_loss = 0
@@ -194,6 +198,7 @@ def evalutate(args, eval_task, eval_output_dir, dataset, model):
         elif args.output_mode == "regression":
             preds = np.squeeze(preds)
         result = compute_metrics(eval_task, preds, out_label_ids)
+        results.update(result)
 
         output_eval_file = os.path.join(eval_output_dir, "eval_results.txt")
         with open(output_eval_file, "w") as writer:
@@ -202,10 +207,10 @@ def evalutate(args, eval_task, eval_output_dir, dataset, model):
                 logger.info("  %s = %s", key, str(result[key]))
                 writer.write("%s = %s\n" % (key, str(result[key])))
 
-    return result
+    return results
 
 
-def load_and_cache_examples(args, task, tokenizer, evaluate=False):
+def load_and_cache_examples(args, task, tokenizer, evaluate=False, overwrite_cache=False):
     processor = processors[task]()
     output_mode = output_modes[task]
     # Load data features from cache or dataset file
@@ -214,7 +219,7 @@ def load_and_cache_examples(args, task, tokenizer, evaluate=False):
         list(filter(None, args.model_name.split('/'))).pop(),
         str(args.max_seq_length),
         str(task)))
-    if os.path.exists(cached_features_file):
+    if os.path.exists(cached_features_file) and not args.overwrite_cache:
         logger.info("Loading features from cached file %s", cached_features_file)
         features = torch.load(cached_features_file)
     else:
@@ -270,39 +275,44 @@ def main():
                         help="Whether to run eval on the dev set.")
     parser.add_argument("--do_lower_case", action='store_true',
                         help="Set this flag if you are using an uncased model.")
-    parser.add_argument("--train_batch_size", default=32, type=int,
-                        help="Total batch size for training.")
+
+    parser.add_argument("--per_gpu_train_batch_size", default=8, type=int,
+                        help="Batch size per GPU for training.")
     parser.add_argument("--eval_batch_size", default=8, type=int,
                         help="Total batch size for eval.")
     parser.add_argument('--gradient_accumulation_steps', type=int, default=1,
                         help="Number of updates steps to accumulate before performing a backward/update pass.")
     parser.add_argument("--learning_rate", default=5e-5, type=float,
                         help="The initial learning rate for Adam.")
+    parser.add_argument("--weight_decay", default=0.0, type=float,
+                        help="Weight deay if we apply some.")
     parser.add_argument("--num_train_epochs", default=3.0, type=float,
                         help="Total number of training epochs to perform.")
     parser.add_argument("--max_steps", default=-1, type=int,
                         help="If > 0: set total number of training steps to perform. Override num_train_epochs.")
     parser.add_argument("--warmup_proportion", default=0.1, type=float,
                         help="Proportion of training with linear learning rate warmup (0.1 = 10%% of training).")
+
+    parser.add_argument('--logging_steps', type=int, default=100,
+                        help="Log every X updates steps.")
     parser.add_argument("--no_cuda", action='store_true',
                         help="Avoid using CUDA when available")
     parser.add_argument('--overwrite_output_dir', action='store_true',
                         help="Overwrite the content of the output directory")
+    parser.add_argument('--overwrite_cache', action='store_true',
+                        help="Overwrite the cached training and evaluation sets")
     parser.add_argument('--seed', type=int, default=42,
                         help="random seed for initialization")
 
     parser.add_argument('--fp16', action='store_true',
-                        help="Whether to use 16-bit float precision instead of 32-bit")
-    parser.add_argument('--loss_scale', type=float, default=0,
-                        help="Loss scaling to improve fp16 numeric stability. Only used when fp16 set to True.\n"
-                             "0 (default value): dynamic loss scaling.\n"
-                             "Positive power of 2: static loss scaling value.\n")
-
+                        help="Whether to use 16-bit (mixed) precision (through NVIDIA apex) instead of 32-bit")
+    parser.add_argument('--fp16_opt_level', type=str, default='O1',
+                        help="For fp16: Apex AMP optimization level selected in ['O0', 'O1', 'O2', and 'O3']."
+                             "See details at https://nvidia.github.io/apex/amp.html")
     parser.add_argument("--local_rank", type=int, default=-1,
-                        help="local_rank for distributed training on gpus")
-
-    parser.add_argument('--server_ip', type=str, default='', help="Can be used for distant debugging.")
-    parser.add_argument('--server_port', type=str, default='', help="Can be used for distant debugging.")
+                        help="For distributed training: local_rank")
+    parser.add_argument('--server_ip', type=str, default='', help="For distant debugging.")
+    parser.add_argument('--server_port', type=str, default='', help="For distant debugging.")
     args = parser.parse_args()
 
     if os.path.exists(args.output_dir) and os.listdir(args.output_dir) and args.do_train and not args.overwrite_output_dir:
@@ -362,13 +372,10 @@ def main():
     if args.local_rank == 0:
         torch.distributed.barrier()
 
-    # Distributed, parrallel and fp16 model
-    if args.fp16:
-        model.half()
+    # Distributed and parrallel training
     model.to(args.device)
     if args.local_rank != -1:
-        model = torch.nn.parallel.DistributedDataParallel(model,
-                                                          device_ids=[args.local_rank],
+        model = torch.nn.parallel.DistributedDataParallel(model, device_ids=[args.local_rank],
                                                           output_device=args.local_rank,
                                                           find_unused_parameters=True)
     elif args.n_gpu > 1:
@@ -377,7 +384,7 @@ def main():
     # Training
     if args.do_train:
         train_dataset = load_and_cache_examples(args, args.task_name, tokenizer, evaluate=False)
-        global_step, tr_loss = train(args, train_dataset, model)
+        global_step, tr_loss = train(args, train_dataset, model, tokenizer)
         logger.info(" global_step = %s, average loss = %s", global_step, tr_loss)
 
 
@@ -402,17 +409,10 @@ def main():
         model.to(args.device)
 
     # Evaluation
-    if args.do_eval and (args.local_rank == -1 or torch.distributed.get_rank() == 0):
-        # Handle MNLI double evaluation
-        eval_task_names = ("mnli", "mnli-mm") if args.task_name == "mnli" else (args.task_name,)
-        eval_outputs_dirs = (args.output_dir, args.output_dir + '-MM') if args.task_name == "mnli" else (args.output_dir,)
-
-        for eval_task, eval_output_dir in zip(eval_task_names, eval_outputs_dirs):
-            eval_dataset = load_and_cache_examples(args, eval_task, tokenizer, evaluate=True)
-
-            result = evalutate(args, eval_task, eval_output_dir, eval_dataset, model)
+    if args.do_eval and args.local_rank in [-1, 0]:
+        results = evaluate(args, model, tokenizer)
 
-        return result
+        return results
 
 
 if __name__ == "__main__":

examples/run_squad.py

@@ -33,36 +33,156 @@ from tqdm import tqdm, trange
 
 from tensorboardX import SummaryWriter
 
-from pytorch_transformers import WEIGHTS_NAME, CONFIG_NAME
-from pytorch_transformers.modeling_bert import BertForQuestionAnswering
-from pytorch_transformers.optimization import BertAdam, WarmupLinearSchedule
-from pytorch_transformers.tokenization_bert import BertTokenizer
+from pytorch_transformers import (BertForQuestionAnswering, XLNetForQuestionAnswering,
+                                  XLMForQuestionAnswering, BERT_PRETRAINED_MODEL_ARCHIVE_MAP,
+                                  XLNET_PRETRAINED_MODEL_ARCHIVE_MAP, XLM_PRETRAINED_MODEL_ARCHIVE_MAP)
+from pytorch_transformers import (BertTokenizer, XLNetTokenizer,
+                                  XLMTokenizer)
 
 from utils_squad import read_squad_examples, convert_examples_to_features, RawResult, write_predictions
 
-if sys.version_info[0] == 2:
-    import cPickle as pickle
-else:
-    import pickle
-
 logger = logging.getLogger(__name__)
 
+ALL_MODELS = sum((tuple(m.keys()) for m in (BERT_PRETRAINED_MODEL_ARCHIVE_MAP,
+                                            XLNET_PRETRAINED_MODEL_ARCHIVE_MAP,
+                                            XLM_PRETRAINED_MODEL_ARCHIVE_MAP)), ())
+
+MODEL_CLASSES = {
+    'bert': BertForQuestionAnswering,
+    'xlnet': XLNetForQuestionAnswering,
+    'xlm': XLMForQuestionAnswering,
+}
+
+TOKENIZER_CLASSES = {
+    'bert': BertTokenizer,
+    'xlnet': XLNetTokenizer,
+    'xlm': XLMTokenizer,
+}
+
+def train(args, train_dataset, model):
+    """ Train the model """
+    if args.local_rank in [-1, 0]:
+        tb_writer = SummaryWriter()
+
+    args.train_batch_size = args.train_batch_size // args.gradient_accumulation_steps
+    train_sampler = RandomSampler(train_dataset) if args.local_rank == -1 else DistributedSampler(train_dataset)
+    train_dataloader = DataLoader(train_dataset, sampler=train_sampler, batch_size=args.train_batch_size)
+
+    if args.max_steps > 0:
+        num_train_optimization_steps = args.max_steps
+        args.num_train_epochs = args.max_steps // (len(train_dataloader) // args.gradient_accumulation_steps) + 1
+    else:
+        num_train_optimization_steps = len(train_dataloader) // args.gradient_accumulation_steps * args.num_train_epochs
+
+    # Prepare optimizer
+    no_decay = ['bias', 'LayerNorm.weight']
+    optimizer_grouped_parameters = [
+        {'params': [p for n, p in model.named_parameters() if not any(nd in n for nd in no_decay)], 'weight_decay': 0.01},
+        {'params': [p for n, p in model.named_parameters() if any(nd in n for nd in no_decay)], 'weight_decay': 0.0}
+        ]
+    optimizer = BertAdam(optimizer_grouped_parameters, lr=args.learning_rate,
+                         t_total=num_train_optimization_steps, warmup=args.warmup_proportion)
+    if args.fp16:
+        try:
+            from apex import amp
+        except ImportError:
+            raise ImportError("Please install apex from https://www.github.com/nvidia/apex to use fp16 training.")
+        model, optimizer = amp.initialize(model, optimizer, opt_level=args.fp16_opt_level)
+
+    # Train!
+    logger.info("***** Running training *****")
+    logger.info("  Num examples = %d", len(train_dataset))
+    logger.info("  Num Epochs = %d", args.num_train_epochs)
+    logger.info("  Batch size = %d", args.train_batch_size)
+    logger.info("  Total batch size (distributed) = %d", args.train_batch_size * (torch.distributed.get_world_size() if args.local_rank != -1 else 1))
+    logger.info("  Gradient Accumulation steps = %d", args.gradient_accumulation_steps)
+    logger.info("  Total optimization steps = %d", num_train_optimization_steps)
+
+    global_step = 0
+    tr_loss, logging_loss = 0.0, 0.0
+    model.train()
+    optimizer.zero_grad()
+    for _ in trange(int(args.num_train_epochs), desc="Epoch", disable=args.local_rank not in [-1, 0]):
+        for step, batch in enumerate(tqdm(train_dataloader, desc="Iteration", disable=args.local_rank not in [-1, 0])):
+            batch = tuple(t.to(args.device) for t in batch)
+            inputs = {'input_ids':      batch[0],
+                      'attention_mask': batch[1],
+                      'token_type_ids': batch[2] if args.model_type in ['bert', 'xlnet'] else None,  # XLM don't use segment_ids
+                      'labels':         batch[3]}
+            ouputs = model(**inputs)
+            loss = ouputs[0]
+
+
+def evalutate(args, dataset, model):
+    """ Evaluate the model """
+
+
+
+def load_and_cache_examples(args, tokenizer, training=True):
+    """ Load data features from cache or dataset file. """
+    cached_features_file = os.path.join(args.data_dir, 'cached_{}_{}_{}_{}'.format(
+        'dev' if evaluate else 'train',
+        list(filter(None, args.model_name.split('/'))).pop(),
+        str(args.max_seq_length),
+        str(task)))
+    if os.path.exists(cached_features_file):
+        logger.info("Loading features from cached file %s", cached_features_file)
+        features = torch.load(cached_features_file)
+    else:
+        logger.info("Creating features from dataset file at %s", args.data_dir)
+        label_list = processor.get_labels()
+        examples = read_squad_examples(input_file=args.train_file if training else args.predict_file,
+                        is_training=training,
+                        version_2_with_negative=args.version_2_with_negative)
+        features = convert_examples_to_features(
+            examples=examples,
+            tokenizer=tokenizer,
+            max_seq_length=args.max_seq_length,
+            doc_stride=args.doc_stride,
+            max_query_length=args.max_query_length,
+            is_training=training)
+        if args.local_rank in [-1, 0]:
+            logger.info("Num orig examples = %d", len(examples))
+            logger.info("Num split examples = %d", len(features))
+            logger.info("Saving features into cached file %s", cached_features_file)
+            torch.save(features, cached_features_file)
+
+    # Convert to Tensors and build dataset
+    all_input_ids = torch.tensor([f.input_ids for f in eval_features], dtype=torch.long)
+    all_input_mask = torch.tensor([f.input_mask for f in eval_features], dtype=torch.long)
+    all_segment_ids = torch.tensor([f.segment_ids for f in eval_features], dtype=torch.long)
+    if training:
+        all_start_positions = torch.tensor([f.start_position for f in train_features], dtype=torch.long)
+        all_end_positions = torch.tensor([f.end_position for f in train_features], dtype=torch.long)
+        dataset = TensorDataset(all_input_ids, all_input_mask, all_segment_ids, all_start_positions, all_end_positions)
+    else:
+        all_example_index = torch.arange(all_input_ids.size(0), dtype=torch.long)
+        dataset = TensorDataset(all_input_ids, all_input_mask, all_segment_ids, all_example_index)
+
+    return dataset
+
 
 def main():
     parser = argparse.ArgumentParser()
 
     ## Required parameters
-    parser.add_argument("--bert_model", default=None, type=str, required=True,
-                        help="Bert pre-trained model selected in the list: bert-base-uncased, "
-                        "bert-large-uncased, bert-base-cased, bert-large-cased, bert-base-multilingual-uncased, "
-                        "bert-base-multilingual-cased, bert-base-chinese.")
+    parser.add_argument("--train_file", default=None, type=str, required=True,
+                        help="SQuAD json for training. E.g., train-v1.1.json")
+    parser.add_argument("--predict_file", default=None, type=str, required=True,
+                        help="SQuAD json for predictions. E.g., dev-v1.1.json or test-v1.1.json")
+    parser.add_argument("--model_name", default=None, type=str, required=True,
+                        help="Bert/XLNet/XLM pre-trained model selected in the list: " + ", ".join(ALL_MODELS))
     parser.add_argument("--output_dir", default=None, type=str, required=True,
                         help="The output directory where the model checkpoints and predictions will be written.")
 
     ## Other parameters
-    parser.add_argument("--train_file", default=None, type=str, help="SQuAD json for training. E.g., train-v1.1.json")
-    parser.add_argument("--predict_file", default=None, type=str,
-                        help="SQuAD json for predictions. E.g., dev-v1.1.json or test-v1.1.json")
+    parser.add_argument('--version_2_with_negative', action='store_true',
+                        help='If true, the SQuAD examples contain some that do not have an answer.')
+    parser.add_argument('--null_score_diff_threshold', type=float, default=0.0,
+                        help="If null_score - best_non_null is greater than the threshold predict null.")
+    parser.add_argument('--overwrite_output_dir', action='store_true',
+                        help="Overwrite the content of the output directory")
+
     parser.add_argument("--max_seq_length", default=384, type=int,
                         help="The maximum total input sequence length after WordPiece tokenization. Sequences "
                              "longer than this will be truncated, and sequences shorter than this will be padded.")
@@ -71,65 +191,53 @@ def main():
     parser.add_argument("--max_query_length", default=64, type=int,
                         help="The maximum number of tokens for the question. Questions longer than this will "
                              "be truncated to this length.")
-    parser.add_argument("--do_train", action='store_true', help="Whether to run training.")
-    parser.add_argument("--do_predict", action='store_true', help="Whether to run eval on the dev set.")
-    parser.add_argument("--train_batch_size", default=32, type=int, help="Total batch size for training.")
-    parser.add_argument("--predict_batch_size", default=8, type=int, help="Total batch size for predictions.")
-    parser.add_argument("--learning_rate", default=5e-5, type=float, help="The initial learning rate for Adam.")
+    parser.add_argument("--do_train", action='store_true',
+                        help="Whether to run training.")
+    parser.add_argument("--do_predict", action='store_true',
+                        help="Whether to run eval on the dev set.")
+    parser.add_argument("--do_lower_case", action='store_true',
+                        help="Whether to lower case the input text. True for uncased models, False for cased models.")
+
+    parser.add_argument("--train_batch_size", default=32, type=int,
+                        help="Total batch size for training.")
+    parser.add_argument("--predict_batch_size", default=8, type=int,
+                        help="Total batch size for predictions.")
+    parser.add_argument("--learning_rate", default=5e-5, type=float,
+                        help="The initial learning rate for Adam.")
+    parser.add_argument('--gradient_accumulation_steps', type=int, default=1,
+                        help="Number of updates steps to accumulate before performing a backward/update pass.")
     parser.add_argument("--num_train_epochs", default=3.0, type=float,
                         help="Total number of training epochs to perform.")
     parser.add_argument("--warmup_proportion", default=0.1, type=float,
-                        help="Proportion of training to perform linear learning rate warmup for. E.g., 0.1 = 10%% "
-                             "of training.")
+                        help="Proportion of training with linear learning rate warmup (0.1 = 10%% of training).")
     parser.add_argument("--n_best_size", default=20, type=int,
-                        help="The total number of n-best predictions to generate in the nbest_predictions.json "
-                             "output file.")
+                        help="The total number of n-best predictions to generate in the nbest_predictions.json output file.")
     parser.add_argument("--max_answer_length", default=30, type=int,
                         help="The maximum length of an answer that can be generated. This is needed because the start "
                              "and end predictions are not conditioned on one another.")
     parser.add_argument("--verbose_logging", action='store_true',
                         help="If true, all of the warnings related to data processing will be printed. "
                              "A number of warnings are expected for a normal SQuAD evaluation.")
-    parser.add_argument("--no_cuda",
-                        action='store_true',
+
+    parser.add_argument("--no_cuda", action='store_true',
                         help="Whether not to use CUDA when available")
-    parser.add_argument('--seed',
-                        type=int,
-                        default=42,
+    parser.add_argument('--seed', type=int, default=42,
                         help="random seed for initialization")
-    parser.add_argument('--gradient_accumulation_steps',
-                        type=int,
-                        default=1,
-                        help="Number of updates steps to accumulate before performing a backward/update pass.")
-    parser.add_argument("--do_lower_case",
-                        action='store_true',
-                        help="Whether to lower case the input text. True for uncased models, False for cased models.")
-    parser.add_argument("--local_rank",
-                        type=int,
-                        default=-1,
+    parser.add_argument("--local_rank", type=int, default=-1,
                         help="local_rank for distributed training on gpus")
-    parser.add_argument('--fp16',
-                        action='store_true',
-                        help="Whether to use 16-bit float precision instead of 32-bit")
-    parser.add_argument('--overwrite_output_dir',
-                        action='store_true',
-                        help="Overwrite the content of the output directory")
-    parser.add_argument('--loss_scale',
-                        type=float, default=0,
-                        help="Loss scaling to improve fp16 numeric stability. Only used when fp16 set to True.\n"
-                             "0 (default value): dynamic loss scaling.\n"
-                             "Positive power of 2: static loss scaling value.\n")
-    parser.add_argument('--version_2_with_negative',
-                        action='store_true',
-                        help='If true, the SQuAD examples contain some that do not have an answer.')
-    parser.add_argument('--null_score_diff_threshold',
-                        type=float, default=0.0,
-                        help="If null_score - best_non_null is greater than the threshold predict null.")
+    parser.add_argument('--fp16', action='store_true',
+                        help="Whether to use 16-bit (mixed) precision (through NVIDIA apex) instead of 32-bit")
+    parser.add_argument('--fp16_opt_level', type=str, default='O1',
+                        help="For fp16: Apex AMP optimization level selected in ['O0', 'O1', 'O2', and 'O3']."
+                             "See details at https://nvidia.github.io/apex/amp.html")
     parser.add_argument('--server_ip', type=str, default='', help="Can be used for distant debugging.")
     parser.add_argument('--server_port', type=str, default='', help="Can be used for distant debugging.")
     args = parser.parse_args()
     print(args)
 
+    if os.path.exists(args.output_dir) and os.listdir(args.output_dir) and args.do_train and not args.overwrite_output_dir:
+        raise ValueError("Output directory ({}) already exists and is not empty. Use --overwrite_output_dir to overcome.".format(args.output_dir))
+
     if args.server_ip and args.server_port:
         # Distant debugging - see https://code.visualstudio.com/docs/python/debugging#_attach-to-a-local-script
         import ptvsd
@@ -137,71 +245,52 @@ def main():
         ptvsd.enable_attach(address=(args.server_ip, args.server_port), redirect_output=True)
         ptvsd.wait_for_attach()
 
+    # Setup CUDA, GPU & distributed training
     if args.local_rank == -1 or args.no_cuda:
         device = torch.device("cuda" if torch.cuda.is_available() and not args.no_cuda else "cpu")
-        n_gpu = torch.cuda.device_count()
-    else:
+        args.n_gpu = torch.cuda.device_count()
+    else:  # Initializes the distributed backend which will take care of sychronizing nodes/GPUs
         torch.cuda.set_device(args.local_rank)
         device = torch.device("cuda", args.local_rank)
-        n_gpu = 1
-        # Initializes the distributed backend which will take care of sychronizing nodes/GPUs
         torch.distributed.init_process_group(backend='nccl')
+        args.n_gpu = 1
+    args.device = device
 
-    logging.basicConfig(format = '%(asctime)s - %(levelname)s - %(name)s -   %(message)s',
-                        datefmt = '%m/%d/%Y %H:%M:%S',
-                        level = logging.INFO if args.local_rank in [-1, 0] else logging.WARN)
-
-    logger.info("device: {} n_gpu: {}, distributed training: {}, 16-bits training: {}".format(
-        device, n_gpu, bool(args.local_rank != -1), args.fp16))
-
-    if args.gradient_accumulation_steps < 1:
-        raise ValueError("Invalid gradient_accumulation_steps parameter: {}, should be >= 1".format(
-                            args.gradient_accumulation_steps))
-
-    args.train_batch_size = args.train_batch_size // args.gradient_accumulation_steps
+    # Setup logging
+    logging.basicConfig(level = logging.INFO if args.local_rank in [-1, 0] else logging.WARN)
+    logger.warning("Process rank: %s, device: %s, n_gpu: %s, distributed training: %s, 16-bits training: %s",
+                args.local_rank, device, args.n_gpu, bool(args.local_rank != -1), args.fp16)
 
+    # Setup seeds
     random.seed(args.seed)
     np.random.seed(args.seed)
     torch.manual_seed(args.seed)
-    if n_gpu > 0:
+    if args.n_gpu > 0:
         torch.cuda.manual_seed_all(args.seed)
 
-    if not args.do_train and not args.do_predict:
-        raise ValueError("At least one of `do_train` or `do_predict` must be True.")
-
-    if args.do_train:
-        if not args.train_file:
-            raise ValueError(
-                "If `do_train` is True, then `train_file` must be specified.")
-    if args.do_predict:
-        if not args.predict_file:
-            raise ValueError(
-                "If `do_predict` is True, then `predict_file` must be specified.")
-
-    if os.path.exists(args.output_dir) and os.listdir(args.output_dir) and args.do_train and not args.overwrite_output_dir:
-        raise ValueError("Output directory {} already exists and is not empty. Use --overwrite_output_dir to overcome.".format(args.output_dir))
-    if not os.path.exists(args.output_dir):
-        os.makedirs(args.output_dir)
-
+    # Load pretrained model and tokenizer
     if args.local_rank not in [-1, 0]:
-        torch.distributed.barrier()  # Make sure only the first process in distributed training will download model & vocab
+        torch.distributed.barrier()  # Make sure only 1st process in distributed training download model & vocab
+
+    args.model_type = args.model_name.lower().split('-')[0]
+    tokenizer_class = TOKENIZER_CLASSES[args.model_type]
+    model_class = MODEL_CLASSES[args.model_type]
+    tokenizer = tokenizer_class.from_pretrained(args.model_name, do_lower_case=args.do_lower_case)
+    model = model_class.from_pretrained(args.model_name, num_labels=num_labels)
 
-    tokenizer = BertTokenizer.from_pretrained(args.bert_model, do_lower_case=args.do_lower_case)
-    model = BertForQuestionAnswering.from_pretrained(args.bert_model)
     if args.local_rank == 0:
         torch.distributed.barrier()
 
-    if args.fp16:
-        model.half()
-    model.to(device)
+    # Distributed and parrallel training
+    model.to(args.device)
     if args.local_rank != -1:
-        model = torch.nn.parallel.DistributedDataParallel(model,
-                                                          device_ids=[args.local_rank],
+        model = torch.nn.parallel.DistributedDataParallel(model, device_ids=[args.local_rank],
                                                           output_device=args.local_rank,
                                                           find_unused_parameters=True)
-    elif n_gpu > 1:
+    elif args.n_gpu > 1:
         model = torch.nn.DataParallel(model)
 
+    # Training
     if args.do_train:
         if args.local_rank in [-1, 0]:
             tb_writer = SummaryWriter()

examples/utils.py

+# Copyright (c) 2019-present, the HuggingFace Inc. authors.
+# All rights reserved. This source code is licensed under the BSD-style
+# license found in the LICENSE file in the root directory of this source tree.
+import logging
+import os
+from tqdm import tqdm
+from pprint import pformat
+
+import torch
+
+from ignite.engine import Engine, Events
+from ignite.handlers import ModelCheckpoint
+from ignite.metrics import RunningAverage
+from ignite.contrib.handlers import ProgressBar
+from ignite.contrib.handlers.tensorboard_logger import OptimizerParamsHandler, OutputHandler, TensorboardLogger
+
+
+def average_distributed_scalar(scalar, args):
+    """ Average a scalar over nodes if we are in distributed training.
+        We use this for distributed evaluation.
+        Beware, such averages only works for metrics which are additive with regard
+        to the evaluation dataset, e.g. accuracy, log probabilities.
+        Doesn't work for ratio metrics like F1.
+    """
+    if args.local_rank == -1:
+        return scalar
+    scalar_t = torch.tensor(scalar, dtype=torch.float, device=args.device) / torch.distributed.get_world_size()
+    torch.distributed.all_reduce(scalar_t, op=torch.distributed.ReduceOp.SUM)
+    return scalar_t.item()
+
+
+def add_logging_and_checkpoint_saving(trainer, evaluator, metrics, model, optimizer, args, prefix=""):
+    """ Add to a PyTorch ignite training engine tensorboard logging,
+        progress bar with average loss, checkpoint saving and save training config.
+    """
+    # Add progress bar with average loss
+    RunningAverage(output_transform=lambda x: x).attach(trainer, prefix + "loss")
+    pbar = ProgressBar(persist=True)
+    pbar.attach(trainer, metric_names=[prefix + "loss"])
+    evaluator.add_event_handler(Events.COMPLETED, lambda _:
+                                pbar.log_message("Validation: %s" % pformat(evaluator.state.metrics)))
+
+    # Add tensorboard logging with training and evaluation metrics
+    tb_logger = TensorboardLogger(log_dir=None)
+    tb_logger.attach(trainer, log_handler=OutputHandler(tag="training", metric_names=[prefix + "loss"]),
+                     event_name=Events.ITERATION_COMPLETED)
+    tb_logger.attach(trainer, log_handler=OptimizerParamsHandler(optimizer),
+                     event_name=Events.ITERATION_STARTED)
+    @evaluator.on(Events.COMPLETED)
+    def tb_log_metrics(engine):
+        for name in metrics.keys():
+            tb_logger.writer.add_scalar(name, engine.state.metrics[name], trainer.state.iteration)
+
+    # Add checkpoint saving after each epoch - take care of distributed encapsulation ('getattr()')
+    checkpoint_handler = ModelCheckpoint(tb_logger.writer.log_dir, 'checkpoint', save_interval=1, n_saved=3)
+    trainer.add_event_handler(Events.EPOCH_COMPLETED, checkpoint_handler, {'mymodel': getattr(model, 'module', model)})
+
+    # Save training configuration
+    torch.save(args, os.path.join(tb_logger.writer.log_dir, CONFIG_NAME))
+
+    return checkpoint_handler, tb_logger

pytorch_transformers/modeling_xlnet.py

@@ -393,7 +393,7 @@ class XLNetRelativeAttention(nn.Module):
         x = x[1:, ...]
         x = x.reshape(x_size[0], x_size[1] - 1, x_size[2], x_size[3])
         # x = x[:, 0:klen, :, :]
-        x = torch.index_select(x, 1, torch.arange(klen))
+        x = torch.index_select(x, 1, torch.arange(klen, device=x.device, dtype=torch.long))
 
         return x
 

pytorch_transformers/optimization.py

@@ -227,6 +227,8 @@ class BertAdam(Optimizer):
         lr = []
         for group in self.param_groups:
             for p in group['params']:
+                if p.grad is None:
+                    continue
                 state = self.state[p]
                 if len(state) == 0:
                     return [0]