diff --git a/fastNLP/api/processor.py b/fastNLP/api/processor.py
index fcda3e7c..b495ea70 100644
--- a/fastNLP/api/processor.py
+++ b/fastNLP/api/processor.py
@@ -77,14 +77,17 @@ class FullSpaceToHalfSpaceProcessor(Processor):
 
     def process(self, dataset):
         assert isinstance(dataset, DataSet), "Only Dataset class is allowed, not {}.".format(type(dataset))
-        for ins in dataset:
+
+        def inner_proc(ins):
             sentence = ins[self.field_name]
-            new_sentence = [None] * len(sentence)
+            new_sentence = [""] * len(sentence)
             for idx, char in enumerate(sentence):
                 if char in self.convert_map:
                     char = self.convert_map[char]
                 new_sentence[idx] = char
-            ins[self.field_name] = ''.join(new_sentence)
+            return "".join(new_sentence)
+
+        dataset.apply(inner_proc, new_field_name=self.field_name)
         return dataset
 
 
@@ -94,9 +97,7 @@ class PreAppendProcessor(Processor):
         self.data = data
 
     def process(self, dataset):
-        for ins in dataset:
-            sent = ins[self.field_name]
-            ins[self.new_added_field_name] = [self.data] + sent
+        dataset.apply(lambda ins: [self.data] + ins[self.field_name], new_field_name=self.new_added_field_name)
         return dataset
 
 
@@ -108,9 +109,7 @@ class SliceProcessor(Processor):
         self.slice = slice(start, end, step)
 
     def process(self, dataset):
-        for ins in dataset:
-            sent = ins[self.field_name]
-            ins[self.new_added_field_name] = sent[self.slice]
+        dataset.apply(lambda ins: ins[self.field_name][self.slice], new_field_name=self.new_added_field_name)
         return dataset
 
 
@@ -121,14 +120,17 @@ class Num2TagProcessor(Processor):
         self.pattern = r'[-+]?([0-9]+[.]?[0-9]*)+[/eE]?[-+]?([0-9]+[.]?[0-9]*)'
 
     def process(self, dataset):
-        for ins in dataset:
+
+        def inner_proc(ins):
             s = ins[self.field_name]
             new_s = [None] * len(s)
             for i, w in enumerate(s):
                 if re.search(self.pattern, w) is not None:
                     w = self.tag
                 new_s[i] = w
-            ins[self.new_added_field_name] = new_s
+            return new_s
+
+        dataset.apply(inner_proc, new_field_name=self.new_added_field_name)
         return dataset
 
 
@@ -149,11 +151,8 @@ class IndexerProcessor(Processor):
 
     def process(self, dataset):
         assert isinstance(dataset, DataSet), "Only DataSet class is allowed, not {}.".format(type(dataset))
-        for ins in dataset:
-            tokens = ins[self.field_name]
-            index = [self.vocab.to_index(token) for token in tokens]
-            ins[self.new_added_field_name] = index
-
+        dataset.apply(lambda ins: [self.vocab.to_index(token) for token in ins[self.field_name]],
+                      new_field_name=self.new_added_field_name)
         if self.is_input:
             dataset.set_input(self.new_added_field_name)
 
@@ -167,6 +166,7 @@ class VocabProcessor(Processor):
     """Build vocabulary with a field in the data set.
 
     """
+
     def __init__(self, field_name):
         super(VocabProcessor, self).__init__(field_name, None)
         self.vocab = Vocabulary()
@@ -175,8 +175,7 @@ class VocabProcessor(Processor):
         for dataset in datasets:
             assert isinstance(dataset, DataSet), "Only Dataset class is allowed, not {}.".format(type(dataset))
             for ins in dataset:
-                tokens = ins[self.field_name]
-                self.vocab.update(tokens)
+                self.vocab.update(ins[self.field_name])
 
     def get_vocab(self):
         self.vocab.build_vocab()
@@ -190,9 +189,7 @@ class SeqLenProcessor(Processor):
 
     def process(self, dataset):
         assert isinstance(dataset, DataSet), "Only Dataset class is allowed, not {}.".format(type(dataset))
-        for ins in dataset:
-            length = len(ins[self.field_name])
-            ins[self.new_added_field_name] = length
+        dataset.apply(lambda ins: len(ins[self.field_name]), new_field_name=self.new_added_field_name)
         if self.is_input:
             dataset.set_input(self.new_added_field_name)
         return dataset
@@ -225,7 +222,7 @@ class ModelProcessor(Processor):
                 for key, value in prediction.items():
                     tmp_batch = []
                     value = value.cpu().numpy()
-                    if len(value.shape) == 1 or (len(value.shape)==2 and value.shape[1]==1):
+                    if len(value.shape) == 1 or (len(value.shape) == 2 and value.shape[1] == 1):
                         batch_output[key].extend(value.tolist())
                     else:
                         for idx, seq_len in enumerate(seq_lens):
@@ -236,7 +233,7 @@ class ModelProcessor(Processor):
 
         # TODO 当前的实现会导致之后的processor需要知道model输出的output的key是什么
         for field_name, fields in batch_output.items():
-            dataset.add_field(field_name, fields, need_tensor=False, is_target=False)
+            dataset.add_field(field_name, fields, is_input=True, is_target=False)
 
         return dataset
 
@@ -254,23 +251,8 @@ class Index2WordProcessor(Processor):
         self.vocab = vocab
 
     def process(self, dataset):
-        for ins in dataset:
-            new_sent = [self.vocab.to_word(w) for w in ins[self.field_name]]
-            ins[self.new_added_field_name] = new_sent
-        return dataset
-
-
-class SetTensorProcessor(Processor):
-    # TODO: remove it. It is strange.
-    def __init__(self, field_dict, default=False):
-        super(SetTensorProcessor, self).__init__(None, None)
-        self.field_dict = field_dict
-        self.default = default
-
-    def process(self, dataset):
-        set_dict = {name: self.default for name in dataset.get_all_fields().keys()}
-        set_dict.update(self.field_dict)
-        dataset._set_need_tensor(**set_dict)
+        dataset.apply(lambda ins: [self.vocab.to_word(w) for w in ins[self.field_name]],
+                      new_field_name=self.new_added_field_name)
         return dataset
 
 
diff --git a/fastNLP/core/optimizer.py b/fastNLP/core/optimizer.py
index f123ae40..fddafbad 100644
--- a/fastNLP/core/optimizer.py
+++ b/fastNLP/core/optimizer.py
@@ -10,7 +10,7 @@ class Optimizer(object):
 
 
 class SGD(Optimizer):
-    def __init__(self, lr=0.01, momentum=0, model_params=None):
+    def __init__(self, lr=0.001, momentum=0, model_params=None):
         """
 
         :param float lr: learning rate. Default: 0.01
@@ -30,7 +30,7 @@ class SGD(Optimizer):
 
 
 class Adam(Optimizer):
-    def __init__(self, lr=0.01, weight_decay=0, model_params=None):
+    def __init__(self, lr=0.001, weight_decay=0, betas=(0.9, 0.999), eps=1e-8, amsgrad=False, model_params=None):
         """
 
         :param float lr: learning rate
@@ -39,7 +39,8 @@ class Adam(Optimizer):
         """
         if not isinstance(lr, float):
             raise TypeError("learning rate has to be float.")
-        super(Adam, self).__init__(model_params, lr=lr, weight_decay=weight_decay)
+        super(Adam, self).__init__(model_params, lr=lr, betas=betas, eps=eps, amsgrad=amsgrad,
+                                   weight_decay=weight_decay)
 
     def construct_from_pytorch(self, model_params):
         if self.model_params is None:
diff --git a/fastNLP/core/tester.py b/fastNLP/core/tester.py
index 392932e8..ef3780a0 100644
--- a/fastNLP/core/tester.py
+++ b/fastNLP/core/tester.py
@@ -31,12 +31,12 @@ class Tester(object):
         self.use_cuda = use_cuda
         self.batch_size = batch_size
         self.verbose = verbose
-        self._model_device = model.parameters().__next__().device
 
         if torch.cuda.is_available() and self.use_cuda:
             self._model = model.cuda()
         else:
             self._model = model
+        self._model_device = model.parameters().__next__().device
 
         # check predict
         if hasattr(self._model, 'predict'):
diff --git a/fastNLP/core/trainer.py b/fastNLP/core/trainer.py
index 5997ebbc..aa5f978c 100644
--- a/fastNLP/core/trainer.py
+++ b/fastNLP/core/trainer.py
@@ -3,6 +3,7 @@ import time
 from datetime import datetime
 from datetime import timedelta
 
+import numpy as np
 import torch
 from tensorboardX import SummaryWriter
 from torch import nn
@@ -97,7 +98,8 @@ class Trainer(object):
 
         if check_code_level > -1:
             _check_code(dataset=train_data, model=model, losser=losser, metrics=metrics, dev_data=dev_data,
-                        metric_key=metric_key, check_level=check_code_level)
+                        metric_key=metric_key, check_level=check_code_level,
+                        batch_size=min(batch_size, DEFAULT_CHECK_BATCH_SIZE))
 
         self.train_data = train_data
         self.dev_data = dev_data  # If None, No validation.
@@ -113,8 +115,6 @@ class Trainer(object):
         self.best_metric_indicator = None
         self.sampler = sampler
 
-        self._model_device = model.parameters().__next__().device
-
         if isinstance(optimizer, torch.optim.Optimizer):
             self.optimizer = optimizer
         else:
@@ -123,6 +123,7 @@ class Trainer(object):
         self.use_tqdm = use_tqdm
         if self.use_tqdm:
             tester_verbose = 0
+            self.print_every = abs(self.print_every)
         else:
             tester_verbose = 1
 
@@ -137,17 +138,44 @@ class Trainer(object):
         self.step = 0
         self.start_time = None  # start timestamp
 
-    def train(self):
-        """Start Training.
+    def train(self, load_best_model=True):
+        """
 
+        开始训练过程。主要有以下几个步骤
+        for epoch in range(num_epochs):
+            (1) 使用Batch从DataSet中按批取出数据，并自动对DataSet中dtype为float, int的fields进行padding。并转换为Tensor。非
+                    float，int类型的参数将不会被转换为Tensor，且不进行padding
+            for batch_x, batch_y in Batch(DataSet):
+                # batch_x中为设置为input的field
+                # batch_y中为设置为target的field
+                (2) 将batch_x的数据送入到model.forward函数中，并获取结果
+                (3) 将batch_y与model.forward的结果一并送入loss中计算loss
+                (4) 获取到loss之后，进行反向求导并更新梯度
+        if dev_data is not None:
+            根据metrics进行evaluation，并根据是否提供了save_path判断是否存储模型
+
+        :param load_best_model: 该参数只有在初始化提供了dev_data的情况下有效，如果True, trainer将在返回之前重新加载dev表现最好的
+            模型参数。
+
+        将会返回一个字典类型的数据, 内含以下内容：
+            seconds: float, 表示训练时长
+            以下三个内容只有在提供了dev_data的情况下会有。
+            best_eval: Dict of Dict, 表示evaluation的结果
+            best_epoch: int，在第几个epoch取得的最佳值
+            best_step: int, 在第几个step(batch)更新取得的最佳值
+
+        return dict:
         """
+        results = {}
         try:
             if torch.cuda.is_available() and self.use_cuda:
                 self.model = self.model.cuda()
+            self._model_device = self.model.parameters().__next__().device
 
             self._mode(self.model, is_test=False)
 
             self.start_time = str(datetime.now().strftime('%Y-%m-%d %H-%M-%S'))
+            start_time = time.time()
             print("training epochs started " + self.start_time, flush=True)
             if self.save_path is None:
                 class psudoSW:
@@ -165,26 +193,37 @@ class Trainer(object):
                 self._tqdm_train()
             else:
                 self._print_train()
-
+            if self.dev_data is not None:
+                print("\nIn Epoch:{}/Step:{}, got best dev performance:".format(self.best_dev_epoch, self.best_dev_step) +
+                      self.tester._format_eval_results(self.best_dev_perf),)
+                results['best_eval'] = self.best_dev_perf
+                results['best_epoch'] = self.best_dev_epoch
+                results['best_step'] = self.best_dev_step
+                if load_best_model:
+                    model_name = "best_" + "_".join([self.model.__class__.__name__, self.metric_key, self.start_time])
+                    # self._load_model(self.model, model_name)
+                    print("Reloaded the best model.")
         finally:
             self._summary_writer.close()
             del self._summary_writer
+        results['seconds'] = round(time.time() - start_time, 2)
+
+        return results
 
     def _tqdm_train(self):
         self.step = 0
         data_iterator = Batch(self.train_data, batch_size=self.batch_size, sampler=self.sampler,
                               as_numpy=False)
         total_steps = data_iterator.num_batches*self.n_epochs
-        epoch = 1
         with tqdm(total=total_steps, postfix='loss:{0:<6.5f}', leave=False, dynamic_ncols=True) as pbar:
-            ava_loss = 0
+            avg_loss = 0
             for epoch in range(1, self.n_epochs+1):
                 pbar.set_description_str(desc="Epoch {}/{}".format(epoch, self.n_epochs))
                 for batch_x, batch_y in data_iterator:
                     _move_dict_value_to_device(batch_x, batch_y, device=self._model_device)
                     prediction = self._data_forward(self.model, batch_x)
                     loss = self._compute_loss(prediction, batch_y)
-                    ava_loss += loss.item()
+                    avg_loss += loss.item()
                     self._grad_backward(loss)
                     self._update()
                     self._summary_writer.add_scalar("loss", loss.item(), global_step=self.step)
@@ -194,18 +233,18 @@ class Trainer(object):
                             # self._summary_writer.add_scalar(name + "_std", param.std(), global_step=self.step)
                             # self._summary_writer.add_scalar(name + "_grad_sum", param.sum(), global_step=self.step)
                     if (self.step+1) % self.print_every == 0:
-                        pbar.set_postfix_str("loss:{0:<6.5f}".format(ava_loss / self.print_every))
-                        ava_loss = 0
-                    pbar.update(1)
+                        pbar.set_postfix_str("loss:{0:<6.5f}".format(avg_loss / self.print_every))
+                        avg_loss = 0
+                        pbar.update(self.print_every)
                     self.step += 1
                     if self.validate_every > 0 and self.step % self.validate_every == 0 \
                             and self.dev_data is not None:
-                        eval_res = self._do_validation()
+                        eval_res = self._do_validation(epoch=epoch, step=self.step)
                         eval_str = "Epoch {}/{}. Step:{}/{}. ".format(epoch, self.n_epochs, self.step, total_steps) + \
                                    self.tester._format_eval_results(eval_res)
                         pbar.write(eval_str)
                 if self.validate_every < 0 and self.dev_data:
-                    eval_res = self._do_validation()
+                    eval_res = self._do_validation(epoch=epoch, step=self.step)
                     eval_str = "Epoch {}/{}. Step:{}/{}. ".format(epoch, self.n_epochs, self.step, total_steps) + \
                                self.tester._format_eval_results(eval_res)
                     pbar.write(eval_str)
@@ -244,25 +283,29 @@ class Trainer(object):
 
                 if (self.validate_every > 0 and self.step % self.validate_every == 0 and
                         self.dev_data is not None):
-                    self._do_validation()
+                    self._do_validation(epoch=epoch, step=self.step)
 
                 self.step += 1
 
             # validate_every override validation at end of epochs
             if self.dev_data and self.validate_every <= 0:
-                self._do_validation()
+                self._do_validation(epoch=epoch, step=self.step)
             epoch += 1
 
-    def _do_validation(self):
+    def _do_validation(self, epoch, step):
         res = self.tester.test()
         for name, metric in res.items():
             for metric_key, metric_val in metric.items():
                 self._summary_writer.add_scalar("valid_{}_{}".format(name, metric_key), metric_val,
                                                 global_step=self.step)
-        if self.save_path is not None and self._better_eval_result(res):
-            metric_key = self.metric_key if self.metric_key is not None else ""
-            self._save_model(self.model,
-                             "best_" + "_".join([self.model.__class__.__name__, metric_key, self.start_time]))
+        if self._better_eval_result(res):
+            if self.save_path is not None:
+                self._save_model(self.model,
+                             "best_" + "_".join([self.model.__class__.__name__, self.metric_key, self.start_time]))
+
+            self.best_dev_perf = res
+            self.best_dev_epoch = epoch
+            self.best_dev_step = step
         return res
 
     def _mode(self, model, is_test=False):
@@ -317,6 +360,16 @@ class Trainer(object):
             else:
                 torch.save(model, model_name)
 
+    def _load_model(self, model, model_name, only_param=False):
+        # TODO: 这个是不是有问题？
+        if self.save_path is not None:
+            model_name = os.path.join(self.save_path, model_name)
+            if only_param:
+                states = torch.save(model.state_dict(), model_name)
+            else:
+                states = torch.save(model, model_name).state_dict()
+            model.load_state_dict(states)
+
     def _better_eval_result(self, metrics):
         """Check if the current epoch yields better validation results.
 
@@ -344,6 +397,21 @@ class Trainer(object):
 DEFAULT_CHECK_BATCH_SIZE = 2
 DEFAULT_CHECK_NUM_BATCH = 2
 
+def _get_value_info(_dict):
+    # given a dict value, return information about this dict's value. Return list of str
+    strs = []
+    for key, value in _dict.items():
+        _str = ''
+        if isinstance(value, torch.Tensor):
+            _str += "\t{}: (1)type:torch.Tensor (2)dtype:{}, (3)shape:{} ".format(key,
+                                                                                  value.dtype, value.size())
+        elif isinstance(value, np.ndarray):
+            _str += "\t{}: (1)type:numpy.ndarray (2)dtype:{}, (3)shape:{} ".format(key,
+                                                                                   value.dtype, value.shape)
+        else:
+            _str += "\t{}: type:{}".format(key, type(value))
+        strs.append(_str)
+    return strs
 
 def _check_code(dataset, model, losser, metrics, batch_size=DEFAULT_CHECK_BATCH_SIZE,
                 dev_data=None, metric_key=None,
@@ -356,8 +424,24 @@ def _check_code(dataset, model, losser, metrics, batch_size=DEFAULT_CHECK_BATCH_
         _move_dict_value_to_device(batch_x, batch_y, device=model_devcie)
         # forward check
         if batch_count==0:
+            info_str = ""
+            input_fields = _get_value_info(batch_x)
+            target_fields = _get_value_info(batch_y)
+            if len(input_fields)>0:
+                info_str += "input fields after batch(if batch size is {}):\n".format(batch_size)
+                info_str += "\n".join(input_fields)
+                info_str += '\n'
+            else:
+                raise RuntimeError("There is no input field.")
+            if len(target_fields)>0:
+                info_str += "target fields after batch(if batch size is {}):\n".format(batch_size)
+                info_str += "\n".join(target_fields)
+                info_str += '\n'
+            else:
+                info_str += 'There is no target field.'
+            print(info_str)
             _check_forward_error(forward_func=model.forward, dataset=dataset,
-                                 batch_x=batch_x, check_level=check_level)
+                                    batch_x=batch_x, check_level=check_level)
 
         refined_batch_x = _build_args(model.forward, **batch_x)
         pred_dict = model(**refined_batch_x)
diff --git a/fastNLP/core/utils.py b/fastNLP/core/utils.py
index c58e4f71..526ade15 100644
--- a/fastNLP/core/utils.py
+++ b/fastNLP/core/utils.py
@@ -125,7 +125,7 @@ def _check_arg_dict_list(func, args):
     input_args = set(input_arg_count.keys())
     missing = list(require_args - input_args)
     unused = list(input_args - all_args)
-    varargs = [] if not spect.varargs else [arg for arg in spect.varargs]
+    varargs = [] if not spect.varargs else [spect.varargs]
     return CheckRes(missing=missing,
                     unused=unused,
                     duplicated=duplicated,
diff --git a/test/api/test_pipeline.py b/test/api/test_pipeline.py
new file mode 100644
index 00000000..c7094790
--- /dev/null
+++ b/test/api/test_pipeline.py
@@ -0,0 +1,6 @@
+import unittest
+
+
+class TestPipeline(unittest.TestCase):
+    def test_case(self):
+        pass
diff --git a/test/api/test_processor.py b/test/api/test_processor.py
index fa6133b9..f515e507 100644
--- a/test/api/test_processor.py
+++ b/test/api/test_processor.py
@@ -1,6 +1,9 @@
+import random
 import unittest
 
-from fastNLP.api.processor import FullSpaceToHalfSpaceProcessor
+from fastNLP import Vocabulary
+from fastNLP.api.processor import FullSpaceToHalfSpaceProcessor, PreAppendProcessor, SliceProcessor, Num2TagProcessor, \
+    IndexerProcessor, VocabProcessor, SeqLenProcessor
 from fastNLP.core.dataset import DataSet
 
 
@@ -9,4 +12,44 @@ class TestProcessor(unittest.TestCase):
         ds = DataSet({"word": ["０0, u１, u), (u２, u2"]})
         proc = FullSpaceToHalfSpaceProcessor("word")
         ds = proc(ds)
-        self.assertTrue(ds.field_arrays["word"].content, ["00, u1, u), (u2, u2"])
+        self.assertEqual(ds.field_arrays["word"].content, ["00, u1, u), (u2, u2"])
+
+    def test_PreAppendProcessor(self):
+        ds = DataSet({"word": [["1234", "3456"], ["8789", "3464"]]})
+        proc = PreAppendProcessor(data="abc", field_name="word")
+        ds = proc(ds)
+        self.assertEqual(ds.field_arrays["word"].content, [["abc", "1234", "3456"], ["abc", "8789", "3464"]])
+
+    def test_SliceProcessor(self):
+        ds = DataSet({"xx": [[random.randint(0, 10) for _ in range(30)]] * 40})
+        proc = SliceProcessor(10, 20, 2, "xx", new_added_field_name="yy")
+        ds = proc(ds)
+        self.assertEqual(len(ds.field_arrays["yy"].content[0]), 5)
+
+    def test_Num2TagProcessor(self):
+        ds = DataSet({"num": [["99.9982", "2134.0"], ["0.002", "234"]]})
+        proc = Num2TagProcessor("<num>", "num")
+        ds = proc(ds)
+        for data in ds.field_arrays["num"].content:
+            for d in data:
+                self.assertEqual(d, "<num>")
+
+    def test_VocabProcessor_and_IndexerProcessor(self):
+        ds = DataSet({"xx": [[str(random.randint(0, 10)) for _ in range(30)]] * 40})
+        vocab_proc = VocabProcessor("xx")
+        vocab_proc(ds)
+        vocab = vocab_proc.vocab
+        self.assertTrue(isinstance(vocab, Vocabulary))
+        self.assertTrue(len(vocab) > 5)
+
+        proc = IndexerProcessor(vocab, "xx", "yy")
+        ds = proc(ds)
+        for data in ds.field_arrays["yy"].content[0]:
+            self.assertTrue(isinstance(data, int))
+
+    def test_SeqLenProcessor(self):
+        ds = DataSet({"xx": [[str(random.randint(0, 10)) for _ in range(30)]] * 10})
+        proc = SeqLenProcessor("xx", "len")
+        ds = proc(ds)
+        for data in ds.field_arrays["len"].content:
+            self.assertEqual(data, 30)
diff --git a/test/core/test_metrics.py b/test/core/test_metrics.py
index c6267664..125b9156 100644
--- a/test/core/test_metrics.py
+++ b/test/core/test_metrics.py
@@ -52,28 +52,24 @@ class TestAccuracyMetric(unittest.TestCase):
     def test_AccuaryMetric4(self):
         # (5) check reset
         metric = AccuracyMetric()
-        pred_dict = {"pred": torch.zeros(4, 3, 2)}
-        target_dict = {'target': torch.zeros(4, 3)}
-        metric(pred_dict=pred_dict, target_dict=target_dict)
-        self.assertDictEqual(metric.get_metric(), {'acc': 1})
-
-        pred_dict = {"pred": torch.zeros(4, 3, 2)}
-        target_dict = {'target': torch.zeros(4, 3) + 1}
+        pred_dict = {"pred": torch.randn(4, 3, 2)}
+        target_dict = {'target': torch.ones(4, 3)}
         metric(pred_dict=pred_dict, target_dict=target_dict)
-        self.assertDictEqual(metric.get_metric(), {'acc': 0})
+        ans = torch.argmax(pred_dict["pred"], dim=2).to(target_dict["target"]) == target_dict["target"]
+        res = metric.get_metric()
+        self.assertTrue(isinstance(res, dict))
+        self.assertTrue("acc" in res)
+        self.assertAlmostEqual(res["acc"], float(ans.float().mean()), places=3)
 
     def test_AccuaryMetric5(self):
         # (5) check reset
         metric = AccuracyMetric()
-        pred_dict = {"pred": torch.zeros(4, 3, 2)}
+        pred_dict = {"pred": torch.randn(4, 3, 2)}
         target_dict = {'target': torch.zeros(4, 3)}
         metric(pred_dict=pred_dict, target_dict=target_dict)
-        self.assertDictEqual(metric.get_metric(reset=False), {'acc': 1})
-
-        pred_dict = {"pred": torch.zeros(4, 3, 2)}
-        target_dict = {'target': torch.zeros(4, 3) + 1}
-        metric(pred_dict=pred_dict, target_dict=target_dict)
-        self.assertDictEqual(metric.get_metric(), {'acc': 0.5})
+        res = metric.get_metric(reset=False)
+        ans = (torch.argmax(pred_dict["pred"], dim=2).float() == target_dict["target"]).float().mean()
+        self.assertAlmostEqual(res["acc"], float(ans), places=4)
 
     def test_AccuaryMetric6(self):
         # (6) check numpy array is not acceptable
@@ -90,10 +86,12 @@ class TestAccuracyMetric(unittest.TestCase):
     def test_AccuaryMetric7(self):
         # (7) check map, match
         metric = AccuracyMetric(pred='predictions', target='targets')
-        pred_dict = {"predictions": torch.zeros(4, 3, 2)}
+        pred_dict = {"predictions": torch.randn(4, 3, 2)}
         target_dict = {'targets': torch.zeros(4, 3)}
         metric(pred_dict=pred_dict, target_dict=target_dict)
-        self.assertDictEqual(metric.get_metric(), {'acc': 1})
+        res = metric.get_metric()
+        ans = (torch.argmax(pred_dict["predictions"], dim=2).float() == target_dict["targets"]).float().mean()
+        self.assertAlmostEqual(res["acc"], float(ans), places=4)
 
     def test_AccuaryMetric8(self):
         # (8) check map, does not match. use stop_fast_param to stop fast param map
diff --git a/test/core/test_trainer.py b/test/core/test_trainer.py
index 2f2505e4..624f2587 100644
--- a/test/core/test_trainer.py
+++ b/test/core/test_trainer.py
@@ -1,10 +1,10 @@
+import time
 import unittest
 
 import numpy as np
 import torch.nn.functional as F
 from torch import nn
-import time
-from fastNLP.core.utils import CheckError
+
 from fastNLP.core.dataset import DataSet
 from fastNLP.core.instance import Instance
 from fastNLP.core.losses import BCELoss
@@ -83,7 +83,7 @@ class TrainerTestGround(unittest.TestCase):
 
         model = Model()
 
-        with self.assertRaises(NameError):
+        with self.assertRaises(RuntimeError):
             trainer = Trainer(
                 train_data=dataset,
                 model=model
diff --git a/tutorials/fastnlp_1_minute_tutorial.ipynb b/tutorials/fastnlp_1_minute_tutorial.ipynb
index e584a405..24b569f6 100644
--- a/tutorials/fastnlp_1_minute_tutorial.ipynb
+++ b/tutorials/fastnlp_1_minute_tutorial.ipynb
@@ -19,16 +19,52 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 50,
+   "execution_count": 3,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "/Users/yh/miniconda2/envs/python3/lib/python3.6/site-packages/tqdm/autonotebook/__init__.py:14: TqdmExperimentalWarning: Using `tqdm.autonotebook.tqdm` in notebook mode. Use `tqdm.tqdm` instead to force console mode (e.g. in jupyter console)\n",
+      "  \" (e.g. in jupyter console)\", TqdmExperimentalWarning)\n"
+     ]
+    }
+   ],
    "source": [
+    "import sys\n",
+    "sys.path.append(\"../\")\n",
+    "\n",
     "from fastNLP import DataSet\n",
+    "\n",
     "# linux_path = \"../test/data_for_tests/tutorial_sample_dataset.csv\"\n",
-    "win_path = \"C:\\\\Users\\zyfeng\\Desktop\\FudanNLP\\\\fastNLP\\\\test\\\\data_for_tests\\\\tutorial_sample_dataset.csv\"\n",
+    "win_path = \"../test/data_for_tests/tutorial_sample_dataset.csv\"\n",
     "ds = DataSet.read_csv(win_path, headers=('raw_sentence', 'label'), sep='\\t')"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": 8,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "{'raw_sentence': this quiet , introspective and entertaining independent is worth seeking .,\n",
+       "'label': 4,\n",
+       "'label_seq': 4,\n",
+       "'words': ['this', 'quiet', ',', 'introspective', 'and', 'entertaining', 'independent', 'is', 'worth', 'seeking', '.']}"
+      ]
+     },
+     "execution_count": 8,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "ds[1]"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -42,7 +78,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 52,
+   "execution_count": 4,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -58,65 +94,15 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 60,
-   "metadata": {
-    "collapsed": false
-   },
+   "execution_count": 5,
+   "metadata": {},
    "outputs": [
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "Train size: "
-     ]
-    },
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      " "
-     ]
-    },
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "54"
-     ]
-    },
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "\n"
-     ]
-    },
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "Test size: "
-     ]
-    },
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      " "
-     ]
-    },
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "23"
-     ]
-    },
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "\n"
+      "Train size:  54\n",
+      "Test size:  23\n"
      ]
     }
    ],
@@ -129,7 +115,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 61,
+   "execution_count": 6,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -177,14 +163,7 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "training epochs started 2018-12-07 14:03:41"
-     ]
-    },
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "\n"
+      "training epochs started 2018-12-07 14:03:41\n"
      ]
     },
     {
@@ -201,84 +180,10 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "\r"
-     ]
-    },
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "Epoch 1/3. Step:2/6. AccuracyMetric: acc=0.26087"
-     ]
-    },
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "\n"
-     ]
-    },
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "\r"
-     ]
-    },
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "Epoch 2/3. Step:4/6. AccuracyMetric: acc=0.347826"
-     ]
-    },
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "\n"
-     ]
-    },
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "\r"
-     ]
-    },
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "Epoch 3/3. Step:6/6. AccuracyMetric: acc=0.608696"
-     ]
-    },
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "\n"
-     ]
-    },
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "\r"
-     ]
-    },
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "Train finished!"
-     ]
-    },
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "\n"
+      "Epoch 1/3. Step:2/6. AccuracyMetric: acc=0.26087\n",
+      "Epoch 2/3. Step:4/6. AccuracyMetric: acc=0.347826\n",
+      "Epoch 3/3. Step:6/6. AccuracyMetric: acc=0.608696\n",
+      "Train finished!\n"
      ]
     }
    ],
@@ -311,23 +216,23 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 2",
+   "display_name": "Python 3",
    "language": "python",
-   "name": "python2"
+   "name": "python3"
   },
   "language_info": {
    "codemirror_mode": {
     "name": "ipython",
-    "version": 2
+    "version": 3
    },
    "file_extension": ".py",
    "mimetype": "text/x-python",
    "name": "python",
    "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython2",
-   "version": "2.7.6"
+   "pygments_lexer": "ipython3",
+   "version": "3.6.7"
   }
  },
  "nbformat": 4,
- "nbformat_minor": 0
+ "nbformat_minor": 1
 }