BertForTokenClassification can not from_pretrained the fine-tuned model?
## ❓ Questions & Help
Thanks the great work!
While, when I wrap the `run_ner.py `scripts in sklearn api style for non-specialists, I met some problem.
It 's ok for training and evaluating, but when predicting the F1-score is much lower than  that of evaluating. As shown in following:

Evaluating result: the F1-score of 0.8242
```
***** Eval results 500 *****
f1 = 0.8101377518505809
loss = 0.10396960769538525
precision = 0.8009887553315238
recall = 0.8194981652286026
***** Eval results 1000 *****
f1 = 0.8242496050552922
loss = 0.09259376796307388
precision = 0.8206035584390052
recall = 0.8279281959734206
```
Predicting Results, the F1-score 0.0934 

```
 precision    recall  f1-score   support

      tim     0.0954    0.0943    0.0949      2014
      org     0.0743    0.0688    0.0714      2021
      geo     0.1004    0.1087    0.1044      3771
      per     0.0843    0.0864    0.0853      1644
      gpe     0.1022    0.1010    0.1016      1623
      nat     0.3333    0.0769    0.1250        13
      art     0.0000    0.0000    0.0000        51
      eve     0.0400    0.0476    0.0435        21

micro avg     0.0930    0.0938    0.0934     11158
macro avg     0.0924    0.0938    0.0929     11158
```

**? ?? why? I have check the code many times. Is that the bug in saving or loading the fine-tuned model?**

The fine-tuning and predicting script based on `transformers-sklearn`

```python
import pandas as pd
from sklearn.model_selection import train_test_split
from transformers_sklearn import BERTologyNERClassifer

if __name__ == '__main__':

    data_df = pd.read_csv('datasets/gmbner/ner_dataset.csv',encoding="utf8")
    data_df.fillna(method="ffill",inplace=True)
    value_counts = data_df['Tag'].value_counts()
    label_list = list(value_counts.to_dict().keys())

    # ## 1. preparing data
    X = []
    y = []
    for label, batch_df in data_df.groupby(by='Sentence #',sort=False):
        words = batch_df['Word'].tolist()
        labels = batch_df['Tag'].tolist()
        assert len(words) == len(labels)
        X.append(words)
        y.append(labels)

    X_train,X_test,y_train,y_test = train_test_split(X,y,test_size=0.1,random_state=520)

    ## 2. customize model
    ner = BERTologyNERClassifer(
        labels=label_list,
        model_type='bert',
        model_name_or_path='bert-base-cased',
        data_dir='ts_data/gmbner',
        output_dir='results/gmbner',
        num_train_epochs=3,
        learning_rate=5e-5,
        logging_steps=500,
        save_steps=500,
        overwrite_output_dir=True
    )
    #
   ## 3. fit
    ner.fit(X_train, y_train)
    # # # #
    ## 4. score
    report = ner.score(X_test, y_test)
    with open('gmbner.txt', 'w', encoding='utf8') as f:
        f.write(report)
```

This is the two scripts in [transformers-sklearn](https://github.com/trueto/transformers_sklearn) for NER task.
`token_classification.py`
```python
import os
import torch
import random
import logging
import numpy as np
from tqdm import tqdm, trange
from torch.nn import CrossEntropyLoss
from torch.utils.data import random_split,TensorDataset,\
    DistributedSampler,RandomSampler,SequentialSampler,DataLoader
from tensorboardX import SummaryWriter
from transformers_sklearn.utils.token_classification_utils import get_labels,\
    read_examples_from_X_y,convert_examples_to_features
from transformers_sklearn.utils.data_utils import to_numpy
from sklearn.base import BaseEstimator,ClassifierMixin
from transformers_sklearn.utils.metrics_utils import f1_score,recall_score,precision_score,classification_report


from transformers import AdamW, get_linear_schedule_with_warmup
from transformers import BertConfig, BertForTokenClassification, BertTokenizer
from transformers import RobertaConfig, RobertaForTokenClassification, RobertaTokenizer
from transformers import DistilBertConfig, DistilBertForTokenClassification, DistilBertTokenizer
from transformers import CamembertConfig, CamembertForTokenClassification, CamembertTokenizer
# from transformers import AlbertConfig,AlbertTokenizer
from transformers_sklearn.model_albert import AlbertForTokenClassification,AlbertTokenizer,AlbertConfig

ALL_MODELS = sum(
    (tuple(conf.pretrained_config_archive_map.keys()) for conf in (BertConfig, RobertaConfig, DistilBertConfig)),
    ())

MODEL_CLASSES = {
    "bert": (BertConfig, BertForTokenClassification, BertTokenizer),
    "roberta": (RobertaConfig, RobertaForTokenClassification, RobertaTokenizer),
    "distilbert": (DistilBertConfig, DistilBertForTokenClassification, DistilBertTokenizer),
    "camembert": (CamembertConfig, CamembertForTokenClassification, CamembertTokenizer),
    "albert":(AlbertConfig,AlbertForTokenClassification,AlbertTokenizer)
}

logger = logging.getLogger(__name__)

def set_seed(seed=520,n_gpu=1):
    random.seed(seed)
    np.random.seed(seed)
    torch.manual_seed(seed)
    if n_gpu > 0:
        torch.cuda.manual_seed_all(seed)

class BERTologyNERClassifer(BaseEstimator,ClassifierMixin):

    def __init__(self,labels,data_dir='ts_data',model_type='bert',
                 model_name_or_path='bert-base-chinese',
                 output_dir='ts_results',config_name='',
                 tokenizer_name='',cache_dir='model_cache',
                 max_seq_length=512,do_lower_case=False,
                 per_gpu_train_batch_size=8,per_gpu_eval_batch_size=8,
                 gradient_accumulation_steps=1,
                 learning_rate=5e-5,weight_decay=0.0,
                 adam_epsilon=1e-8,max_grad_norm=1.0,
                 num_train_epochs=3.0,max_steps=-1,
                 warmup_steps=0,logging_steps=50,
                 save_steps=50,evaluate_during_training=True,
                 no_cuda=False,overwrite_output_dir=False,
                 overwrite_cache=False,seed=520,
                 fp16=False,fp16_opt_level='01',
                 local_rank=-1,val_fraction=0.1):
        self.labels = labels
        self.data_dir = data_dir
        self.model_type = model_type
        self.model_name_or_path = model_name_or_path
        self.output_dir = output_dir
        self.config_name = config_name
        self.tokenizer_name = tokenizer_name
        self.max_seq_length = max_seq_length
        self.do_lower_case = do_lower_case
        self.cache_dir = cache_dir
        self.per_gpu_train_batch_size = per_gpu_train_batch_size
        self.per_gpu_eval_batch_size = per_gpu_eval_batch_size
        self.gradient_accumulation_steps = gradient_accumulation_steps
        self.learning_rate = learning_rate
        self.weight_decay = weight_decay
        self.adam_epsilon = adam_epsilon
        self.max_grad_norm = max_grad_norm
        self.num_train_epochs = num_train_epochs
        self.max_steps = max_steps
        self.warmup_steps = warmup_steps
        self.logging_steps = logging_steps
        self.save_steps = save_steps
        self.evaluate_during_training = evaluate_during_training
        self.no_cuda = no_cuda
        self.overwrite_output_dir = overwrite_output_dir
        self.overwrite_cache = overwrite_cache
        self.seed = seed
        self.fp16 = fp16
        self.fp16_opt_level = fp16_opt_level
        self.local_rank = local_rank
        self.val_fraction = val_fraction

        self.id2label = {i: label for i, label in enumerate(self.labels)}
        self.label_map = {label: i  for i, label in enumerate(self.labels)}

        # Setup CUDA, GPU & distributed training
        if self.local_rank == -1 or self.no_cuda:
            device = torch.device("cuda" if torch.cuda.is_available() and not self.no_cuda else "cpu")
            self.n_gpu = torch.cuda.device_count() if not self.no_cuda else 1
        else:  # Initializes the distributed backend which will take care of sychronizing nodes/GPUs
            torch.cuda.set_device(self.local_rank)
            device = torch.device("cuda", self.local_rank)
            torch.distributed.init_process_group(backend="nccl")
            self.n_gpu = 1
        self.device = device

        # Setup logging
        logging.basicConfig(format="%(asctime)s - %(levelname)s - %(name)s -   %(message)s",
                            datefmt="%m/%d/%Y %H:%M:%S",
                            level=logging.INFO if self.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",
                       self.local_rank, device, self.n_gpu, bool(self.local_rank != -1), self.fp16)

        # Set seed
        set_seed(seed=self.seed,n_gpu=self.n_gpu)


    def fit(self,X,y):
        if not os.path.exists(self.data_dir):
            os.mkdir(self.data_dir)

        if not os.path.exists(self.output_dir):
            os.mkdir(self.output_dir)

        if os.path.exists(self.output_dir) and os.listdir(
                self.output_dir) and not self.overwrite_output_dir:
            raise ValueError(
                "Output directory ({}) already exists and is not empty. Use --overwrite_output_dir to overcome.".format(
                    self.output_dir))

        num_labels = len(self.labels)
        # self.labels = labels
        # Use cross entropy ignore index as padding label id so that only real label ids contribute to the loss later
        pad_token_label_id = CrossEntropyLoss().ignore_index
        self.pad_token_label_id = pad_token_label_id
        # Load pretrained model and tokenizer
        if self.local_rank not in [-1, 0]:
            torch.distributed.barrier()  # Make sure only the first process in distributed training will download model & vocab

        self.model_type = self.model_type.lower()
        config_class, model_class, tokenizer_class = MODEL_CLASSES[self.model_type]
        config = config_class.from_pretrained(self.config_name if self.config_name else self.model_name_or_path,
                                              num_labels=num_labels,
                                              cache_dir=self.cache_dir if self.cache_dir else None,
                                              share_type='all' if self.model_type=='albert' else None)
        tokenizer = tokenizer_class.from_pretrained(
            self.tokenizer_name if self.tokenizer_name else self.model_name_or_path,
            do_lower_case=self.do_lower_case,
            cache_dir=self.cache_dir if self.cache_dir else None)
        model = model_class.from_pretrained(self.model_name_or_path,
                                            from_tf=bool(".ckpt" in self.model_name_or_path),
                                            config=config,
                                            cache_dir=self.cache_dir if self.cache_dir else None)

        if self.local_rank == 0:
            torch.distributed.barrier()  # Make sure only the first process in distributed training will download model & vocab

        model.to(self.device)

        logger.info("Training/evaluation parameters %s", self)

        train_dataset = load_and_cache_examples(self, tokenizer, pad_token_label_id, X,y, mode="train")
        global_step, tr_loss = train(self, train_dataset,model,tokenizer,pad_token_label_id)
        logger.info(" global_step = %s, average loss = %s", global_step, tr_loss)

        # Saving best-practices: if you use defaults names for the model, you can reload it using from_pretrained()
        if self.local_rank == -1 or torch.distributed.get_rank() == 0:
            # Create output directory if needed
            if not os.path.exists(self.output_dir) and self.local_rank in [-1, 0]:
                os.makedirs(self.output_dir)

            logger.info("Saving model checkpoint to %s", self.output_dir)
            # Save a trained model, configuration and tokenizer using `save_pretrained()`.
            # They can then be reloaded using `from_pretrained()`
            model_to_save = model.module if hasattr(model,"module") else model  # Take care of distributed/parallel training
            model_to_save.save_pretrained(self.output_dir)
            tokenizer.save_pretrained(self.output_dir)

            # Good practice: save your training arguments together with the trained model
            torch.save(self, os.path.join(self.output_dir, "training_args.bin"))

        return self

    def predict(self,X):
        # args = torch.load(os.path.join(self.output_dir, "training_args.bin"))
        # Load a trained model and vocabulary that you have fine-tuned
        _, model_class, tokenizer_class = MODEL_CLASSES[self.model_type]
        model = model_class.from_pretrained(self.output_dir)
        tokenizer = tokenizer_class.from_pretrained(self.output_dir)

        model.to(self.device)

        pad_token_label_id = CrossEntropyLoss().ignore_index
        # get dataset
        test_dataset = load_and_cache_examples(self,tokenizer,pad_token_label_id,X,y=None,mode='test')

        _, preds_list = evaluate(self,test_dataset,model,pad_token_label_id,mode='test')

        return preds_list

    def score(self, X, y, sample_weight=None):
        y_pred = self.predict(X)
        return classification_report(y,y_pred,digits=4)


def load_and_cache_examples(args, tokenizer,pad_token_label_id, X,y,mode):
    if args.local_rank not in [-1, 0] and mode=='train':
        torch.distributed.barrier()  # Make sure only the first process in distributed training process the dataset, and the others will use the cache

    # Load data features from cache or dataset file
    cached_features_file = os.path.join(args.data_dir, "cached_{}_{}_{}".format(mode,
        args.model_type,
        str(args.max_seq_length)))
    if os.path.exists(cached_features_file) and not args.overwrite_cache and mode=='train':
        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)
        examples = read_examples_from_X_y(X,y, mode)
        features = convert_examples_to_features(examples, args.label_map, args.max_seq_length, tokenizer,
                                                cls_token_at_end=bool(args.model_type in ["xlnet"]),
                                                # xlnet has a cls token at the end
                                                cls_token=tokenizer.cls_token,
                                                cls_token_segment_id=2 if args.model_type in ["xlnet"] else 0,
                                                sep_token=tokenizer.sep_token,
                                                sep_token_extra=bool(args.model_type in ["roberta"]),
                                                # roberta uses an extra separator b/w pairs of sentences, cf. github.com/pytorch/fairseq/commit/1684e166e3da03f5b600dbb7855cb98ddfcd0805
                                                pad_on_left=bool(args.model_type in ["xlnet"]),
                                                # pad on the left for xlnet
                                                pad_token=tokenizer.convert_tokens_to_ids([tokenizer.pad_token])[0],
                                                pad_token_segment_id=4 if args.model_type in ["xlnet"] else 0,
                                                pad_token_label_id=pad_token_label_id
                                                )
        if args.local_rank in [-1, 0] and mode == 'train':
            logger.info("Saving features into cached file %s", cached_features_file)
            torch.save(features, cached_features_file)

    if args.local_rank == 0 and mode =='train':
        torch.distributed.barrier()  # Make sure only the first process in distributed training process the dataset, and the others will use the cache

    # Convert to Tensors and build dataset
    all_input_ids = torch.tensor([f.input_ids for f in features], dtype=torch.long)
    all_input_mask = torch.tensor([f.input_mask for f in features], dtype=torch.long)
    all_segment_ids = torch.tensor([f.segment_ids for f in features], dtype=torch.long)
    all_label_ids = torch.tensor([f.label_ids for f in features], dtype=torch.long)

    dataset = TensorDataset(all_input_ids, all_input_mask, all_segment_ids, all_label_ids)
    return dataset

def train(args, train_dataset, model, tokenizer, pad_token_label_id):
    """ Train the model """
    if args.local_rank in [-1, 0]:
        tb_writer = SummaryWriter()

    args.train_batch_size = args.per_gpu_train_batch_size * max(1, args.n_gpu)

    val_len = int(len(train_dataset)*args.val_fraction)
    train_len = len(train_dataset) - val_len
    train_ds, val_ds = random_split(train_dataset,[train_len,val_len])
    train_sampler = RandomSampler(train_ds) if args.local_rank == -1 else DistributedSampler(train_ds)
    train_dataloader = DataLoader(train_ds, sampler=train_sampler, batch_size=args.train_batch_size)

    if args.max_steps > 0:
        t_total = args.max_steps
        args.num_train_epochs = args.max_steps // (len(train_dataloader) // args.gradient_accumulation_steps) + 1
    else:
        t_total = len(train_dataloader) // args.gradient_accumulation_steps * args.num_train_epochs

    # Prepare optimizer and schedule (linear warmup and decay)
    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": 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 = AdamW(optimizer_grouped_parameters, lr=args.learning_rate, eps=args.adam_epsilon)
    scheduler = get_linear_schedule_with_warmup(optimizer, num_warmup_steps=args.warmup_steps, num_training_steps=t_total)

    # Check if saved optimizer or scheduler states exist
    if os.path.isfile(os.path.join(args.model_name_or_path, "optimizer.pt")) and os.path.isfile(
            os.path.join(args.model_name_or_path, "scheduler.pt")
    ):
        # Load in optimizer and scheduler states
        optimizer.load_state_dict(torch.load(os.path.join(args.model_name_or_path, "optimizer.pt")))
        scheduler.load_state_dict(torch.load(os.path.join(args.model_name_or_path, "scheduler.pt")))

    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)

    # multi-gpu training (should be after apex fp16 initialization)
    if args.n_gpu > 1:
        model = torch.nn.DataParallel(model)

    # Distributed training (should be after apex fp16 initialization)
    if args.local_rank != -1:
        model = torch.nn.parallel.DistributedDataParallel(model, device_ids=[args.local_rank],
                                                          output_device=args.local_rank,
                                                          find_unused_parameters=True)

    # Train!
    logger.info("***** Running training *****")
    logger.info("  Num examples = %d", len(train_ds))
    logger.info("  Num Epochs = %d", args.num_train_epochs)
    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", t_total)

    global_step = 0
    epochs_trained = 0
    steps_trained_in_current_epoch = 0
    # Check if continuing training from a checkpoint
    if os.path.exists(args.model_name_or_path):
        # set global_step to gobal_step of last saved checkpoint from model path
        global_step = int(args.model_name_or_path.split("-")[-1].split("/")[0])
        epochs_trained = global_step // (len(train_dataloader) // args.gradient_accumulation_steps)
        steps_trained_in_current_epoch = global_step % (len(train_dataloader) // args.gradient_accumulation_steps)

        logger.info("  Continuing training from checkpoint, will skip to saved global_step")
        logger.info("  Continuing training from epoch %d", epochs_trained)
        logger.info("  Continuing training from global step %d", global_step)
        logger.info("  Will skip the first %d steps in the first epoch", steps_trained_in_current_epoch)

    tr_loss, logging_loss = 0.0, 0.0
    model.zero_grad()
    train_iterator = trange(int(args.num_train_epochs), desc="Epoch", disable=args.local_rank not in [-1, 0])
    set_seed(seed=args.seed,n_gpu=args.n_gpu)  # Added here for reproductibility (even between python 2 and 3)
    for _ in train_iterator:
        epoch_iterator = tqdm(train_dataloader, desc="Iteration", disable=args.local_rank not in [-1, 0])
        for step, batch in enumerate(epoch_iterator):

            # Skip past any already trained steps if resuming training
            if steps_trained_in_current_epoch > 0:
                steps_trained_in_current_epoch -= 1
                continue

            model.train()
            batch = tuple(t.to(args.device) for t in batch)
            inputs = {"input_ids": batch[0],
                      "attention_mask": batch[1],
                      "labels": batch[3]}
            if args.model_type != "distilbert":
                inputs["token_type_ids"] = batch[2] if args.model_type in ["bert", "xlnet"] else None  # XLM and RoBERTa don"t use segment_ids

            outputs = model(**inputs)
            loss = outputs[0]  # model outputs are always tuple in pytorch-transformers (see doc)

            if args.n_gpu > 1:
                loss = loss.mean()  # mean() to average on multi-gpu parallel training
            if args.gradient_accumulation_steps > 1:
                loss = loss / args.gradient_accumulation_steps

            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:
                    torch.nn.utils.clip_grad_norm_(amp.master_params(optimizer), args.max_grad_norm)
                else:
                    torch.nn.utils.clip_grad_norm_(model.parameters(), args.max_grad_norm)

                optimizer.step()
                scheduler.step()  # Update learning rate schedule
                model.zero_grad()
                global_step += 1

                if args.local_rank in [-1, 0] and args.logging_steps > 0 and global_step % args.logging_steps == 0:
                    # Log metrics
                    if args.local_rank == -1 and args.evaluate_during_training:  # Only evaluate when single GPU otherwise metrics may not average well
                        results, _ = evaluate(args, val_ds, model,pad_token_label_id,prefix=global_step)
                        for key, value in results.items():
                            tb_writer.add_scalar("eval_{}".format(key), value, global_step)
                    tb_writer.add_scalar("lr", scheduler.get_lr()[0], global_step)
                    tb_writer.add_scalar("loss", (tr_loss - logging_loss) / args.logging_steps, global_step)
                    logging_loss = tr_loss

                if args.local_rank in [-1, 0] and args.save_steps > 0 and global_step % args.save_steps == 0:
                    # Save model checkpoint
                    output_dir = os.path.join(args.output_dir, "checkpoint-{}".format(global_step))
                    if not os.path.exists(output_dir):
                        os.makedirs(output_dir)
                    model_to_save = model.module if hasattr(model, "module") else model  # Take care of distributed/parallel training
                    model_to_save.save_pretrained(output_dir)
                    tokenizer.save_pretrained(output_dir)

                    torch.save(args, os.path.join(output_dir, "training_args.bin"))
                    logger.info("Saving model checkpoint to %s", output_dir)

                    torch.save(optimizer.state_dict(), os.path.join(output_dir, "optimizer.pt"))
                    torch.save(scheduler.state_dict(), os.path.join(output_dir, "scheduler.pt"))
                    logger.info("Saving optimizer and scheduler states to %s", output_dir)

            if args.max_steps > 0 and global_step > args.max_steps:
                epoch_iterator.close()
                break
        if args.max_steps > 0 and global_step > args.max_steps:
            train_iterator.close()
            break

    if args.local_rank in [-1, 0]:
        tb_writer.close()

    return global_step, tr_loss / global_step


def evaluate(args, eval_dataset, model, pad_token_label_id, mode='dev',prefix=0):
    # eval_dataset = load_and_cache_examples(args, tokenizer, labels, pad_token_label_id, mode=mode)

    args.eval_batch_size = args.per_gpu_eval_batch_size * max(1, args.n_gpu)
    # Note that DistributedSampler samples randomly
    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)

    # multi-gpu evaluate
    if args.n_gpu > 1 and mode == 'test':
        model = torch.nn.DataParallel(model)

    # Eval!
    if mode == 'dev':
        logger.info("***** Running evaluation %s *****", prefix)
    else:
        logger.info("***** Running predict *****")
    logger.info("  Num examples = %d", len(eval_dataset))
    logger.info("  Batch size = %d", args.eval_batch_size)
    eval_loss = 0.0
    nb_eval_steps = 0
    preds = None
    out_label_ids = None
    model.eval()
    for batch in tqdm(eval_dataloader, desc="Evaluating" if mode=='dev' else "Predicting"):
        batch = tuple(t.to(args.device) for t in batch)

        with torch.no_grad():
            inputs = {"input_ids": batch[0],"attention_mask": batch[1],"labels": batch[3]}
            if args.model_type != "distilbert":
                inputs["token_type_ids"] = batch[2] if args.model_type in ["bert", "xlnet"] else None  # XLM and RoBERTa don"t use segment_ids
            outputs = model(**inputs)
            tmp_eval_loss, logits = outputs[:2]

            if args.n_gpu > 1:
                tmp_eval_loss = tmp_eval_loss.mean()  # mean() to average on multi-gpu parallel evaluating

            eval_loss += tmp_eval_loss.item()
        nb_eval_steps += 1
        if preds is None:
            preds = logits.detach().cpu().numpy()
            out_label_ids = inputs["labels"].detach().cpu().numpy()
        else:
            preds = np.append(preds, logits.detach().cpu().numpy(), axis=0)
            out_label_ids = np.append(out_label_ids, inputs["labels"].detach().cpu().numpy(), axis=0)

    eval_loss = eval_loss / nb_eval_steps
    preds = np.argmax(preds, axis=2)

    # label_map = {i: label for i, label in enumerate(labels)}

    out_label_list = [[] for _ in range(out_label_ids.shape[0])]
    preds_list = [[] for _ in range(out_label_ids.shape[0])]

    for i in range(out_label_ids.shape[0]):
        for j in range(out_label_ids.shape[1]):
            if out_label_ids[i, j] != pad_token_label_id:
                out_label_list[i].append(args.id2label[out_label_ids[i][j]])
                preds_list[i].append(args.id2label[preds[i][j]])

    results = {
        "loss": eval_loss,
        "precision": precision_score(out_label_list, preds_list),
        "recall": recall_score(out_label_list, preds_list),
        "f1": f1_score(out_label_list, preds_list)
    }

    if mode == 'dev':
        output_eval_file = os.path.join(args.output_dir, "eval_results.txt")
        with open(output_eval_file, "a") as writer:
            logger.info("***** Eval results %d *****",prefix)
            writer.write("***** Eval results {} *****".format(prefix))
            for key in sorted(results.keys()):
                msg = "{} = {}".format(key, str(results[key]))
                logger.info(msg)
                writer.write(msg)
                writer.write('\n')
            writer.write('\n')

    return results, preds_list
```

<!-- A clear and concise description of the question. -->

Hi there, I had this same issue.
In my case, it was a tokenizer issue. For 
`--tokenizer_name` use "bert-base-multilingual-cased" or "bert-base-multilingual-uncased" solved the problem.<|||||>> Hi there, I had this same issue.
> In my case, it was a tokenizer issue. For
> `--tokenizer_name` use "bert-base-multilingual-cased" or "bert-base-multilingual-uncased" solved the problem.

Thanks!  I tried it. But it can't work in my case<|||||>sorry, it's my fault. I read the data in 'latin1' encode, and skiped the whole line when the length of tokens does not equal that of label_ids. Change the csv file as 'utf8' encoding format, then everthing work as excepted!