refine callback, add unittest for callback

hapi/callbacks.py

@@ -33,7 +33,7 @@ def config_callbacks(callbacks=None,
     cbks = callbacks or []
     cbks = cbks if isinstance(cbks, (list, tuple)) else [cbks]
     if not any(isinstance(k, ProgBarLogger) for k in cbks) and verbose:
-        cbks = cbks + [ProgBarLogger(log_freq, verbose=verbose)]
+        cbks = [ProgBarLogger(log_freq, verbose=verbose)] + cbks
 
     if not any(isinstance(k, ModelCheckpoint) for k in cbks):
         cbks = cbks + [ModelCheckpoint(save_freq, save_dir)]
@@ -110,6 +110,9 @@ class CallbackList(object):
 
 
 class Callback(object):
+    """Base class used to build new callbacks.
+    """
+
     def __init__(self):
         self.model = None
         self.params = {}
@@ -121,63 +124,115 @@ class Callback(object):
         self.model = model
 
     def on_train_begin(self, logs=None):
-        """
+        """Called at the start of train.
         """
 
     def on_train_end(self, logs=None):
-        """
+        """Called at the end of train.
         """
 
     def on_eval_begin(self, logs=None):
-        """
+        """Called at the start of eval.
         """
 
     def on_eval_end(self, logs=None):
-        """
+        """Called at the end of train.
         """
 
     def on_test_begin(self, logs=None):
-        """
+        """Called at the test of begin.
         """
 
     def on_test_end(self, logs=None):
-        """
+        """Called at the test of end.
         """
 
     def on_epoch_begin(self, epoch, logs=None):
-        """
+        """Called at the beginning of each epoch.
         """
 
     def on_epoch_end(self, epoch, logs=None):
-        """
+        """Called at the end of each epoch.
         """
 
     def on_train_batch_begin(self, step, logs=None):
-        """
+        """Called at the beginning of each batch in `train` mode.
         """
 
     def on_train_batch_end(self, step, logs=None):
-        """
+        """Called at the end of each batch in `train` mode.
         """
 
     def on_eval_batch_begin(self, step, logs=None):
-        """
+        """Called at the beginning of each batch in `eval` mode.
         """
 
     def on_eval_batch_end(self, step, logs=None):
-        """
+        """Called at the end of each batch in `eval` mode.
         """
 
-    def on_eval_batch_begin(self, step, logs=None):
-        """
+    def on_test_batch_begin(self, step, logs=None):
+        """Called at the beginning of each batch in `test` mode.
         """
 
-    def on_eval_batch_end(self, step, logs=None):
-        """
+    def on_test_batch_end(self, step, logs=None):
+        """Called at the end of each batch in `test` mode.
         """
 
 
 class ProgBarLogger(Callback):
+    """Logger callback function
+    Args:
+        log_freq (int): The frequency, in number of steps, the training logs
+                are printed. Default: 1.
+        verbose (int): The verbosity mode, should be 0, 1, or 2.
+                0 = silent, 1 = progress bar, 2 = one line per epoch. Default: 2.
+
+    Examples:
+        .. code-block:: python
+
+            import numpy as np
+            from paddle import fluid
+            from hapi.metrics import Accuracy
+            from hapi.loss import CrossEntropy
+            from hapi.datasets import MNIST
+            from hapi.vision.transforms import Compose, Resize
+            from hapi.vision.models import LeNet
+            from hapi.callbacks import ProgBarLogger
+            from hapi.model import Input, set_device
+
+            class MnistDataset(MNIST):
+                def __init__(self, mode, return_label=True):
+                    super(MnistDataset, self).__init__(mode=mode)
+                    self.return_label = return_label
+
+                def __getitem__(self, idx):
+                    img = np.reshape(self.images[idx], [1, 28, 28])
+                    if self.return_label:
+                        return img, np.array(self.labels[idx]).astype('int64')
+                    return img,
+
+                def __len__(self):
+                    return len(self.images)
+
+            inputs = [Input([-1, 1, 28, 28], 'float32', name='image')]
+            labels = [Input([None, 1], 'int64', name='label')]
+
+            train_dataset = MnistDataset(mode='train')
+
+            model = LeNet()
+
+            optim = fluid.optimizer.Adam(0.001)
+            model.prepare(optimizer=optim, 
+                        loss_function=CrossEntropy(), 
+                        metrics=Accuracy(), 
+                        inputs=inputs, 
+                        labels=labels)
+
+            callback = ProgBarLogger(log_freq=10)
+            model.fit(train_dataset, batch_size=64, callbacks=callback)
+    """
+
     def __init__(self, log_freq=1, verbose=2):
         self.epochs = None
         self.steps = None
@@ -204,9 +259,11 @@ class ProgBarLogger(Callback):
         metrics = getattr(self, '%s_metrics' % (mode))
         progbar = getattr(self, '%s_progbar' % (mode))
         steps = getattr(self, '%s_step' % (mode))
+
         for k in metrics:
             if k in logs:
                 values.append((k, logs[k]))
+
         progbar.update(steps, values)
 
     def on_train_batch_end(self, step, logs=None):
@@ -220,7 +277,9 @@ class ProgBarLogger(Callback):
 
     def on_epoch_end(self, epoch, logs=None):
         logs = logs or {}
-        if self.train_step % self.log_freq != 0 and self.verbose and ParallelEnv(
+        if self.verbose == 1 and ParallelEnv().local_rank == 0:
+            self._updates(logs, 'train')
+        elif self.train_step % self.log_freq != 0 and self.verbose and ParallelEnv(
         ).local_rank == 0:
             self._updates(logs, 'train')
 
@@ -229,6 +288,7 @@ class ProgBarLogger(Callback):
         self.eval_metrics = logs.get('metrics_name', [])
         self.eval_step = 0
         self.evaled_samples = 0
+
         self.eval_progbar = ProgressBar(
             num=self.eval_steps, verbose=self.verbose)
         if ParallelEnv().local_rank == 0:
@@ -245,15 +305,95 @@ class ProgBarLogger(Callback):
             if self.eval_steps is None or self.eval_step < self.eval_steps:
                 self._updates(logs, 'eval')
 
+    def on_test_begin(self, logs=None):
+        self.test_steps = logs.get('steps', None)
+        self.test_metrics = logs.get('metrics_name', [])
+        self.test_step = 0
+        self.tested_samples = 0
+        self.test_progbar = ProgressBar(
+            num=self.test_steps, verbose=self.verbose)
+        if ParallelEnv().local_rank == 0:
+            print('Predict begin...')
+
+    def on_test_batch_end(self, step, logs=None):
+        logs = logs or {}
+        self.test_step += 1
+        samples = logs.get('batch_size', 1)
+        self.tested_samples += samples
+
+        if self.test_step % self.log_freq == 0 and self.verbose and ParallelEnv(
+        ).local_rank == 0:
+            if self.test_steps is None or self.test_step < self.test_steps:
+                self._updates(logs, 'test')
+
     def on_eval_end(self, logs=None):
         logs = logs or {}
         if self.verbose and ParallelEnv().local_rank == 0:
-            if self.eval_step % self.log_freq != 0:
+            if self.eval_step % self.log_freq != 0 or self.verbose == 1:
                 self._updates(logs, 'eval')
             print('Eval samples: %d' % (self.evaled_samples))
 
+    def on_test_end(self, logs=None):
+        logs = logs or {}
+        if self.verbose and ParallelEnv().local_rank == 0:
+            if self.test_step % self.log_freq != 0 or self.verbose == 1:
+                self._updates(logs, 'test')
+            print('Predict samples: %d' % (self.tested_samples))
+
 
 class ModelCheckpoint(Callback):
+    """Model checkpoint callback function
+    Args:
+        save_freq(int): The frequency, in number of epochs, the model checkpoint 
+                        are saved. Default: 1.
+        save_dir(str|None): The directory to save checkpoint during training.
+                If None, will not save checkpoint. Default: None.
+
+    Examples:
+        .. code-block:: python
+
+            import numpy as np
+            from paddle import fluid
+            from hapi.metrics import Accuracy
+            from hapi.loss import CrossEntropy
+            from hapi.datasets import MNIST
+            from hapi.vision.transforms import Compose, Resize
+            from hapi.vision.models import LeNet
+            from hapi.callbacks import ModelCheckpoint
+            from hapi.model import Input, set_device
+
+            class MnistDataset(MNIST):
+                def __init__(self, mode, return_label=True):
+                    super(MnistDataset, self).__init__(mode=mode)
+                    self.return_label = return_label
+
+                def __getitem__(self, idx):
+                    img = np.reshape(self.images[idx], [1, 28, 28])
+                    if self.return_label:
+                        return img, np.array(self.labels[idx]).astype('int64')
+                    return img,
+
+                def __len__(self):
+                    return len(self.images)
+
+            inputs = [Input([-1, 1, 28, 28], 'float32', name='image')]
+            labels = [Input([None, 1], 'int64', name='label')]
+
+            train_dataset = MnistDataset(mode='train')
+
+            model = LeNet()
+
+            optim = fluid.optimizer.Adam(0.001)
+            model.prepare(optimizer=optim, 
+                        loss_function=CrossEntropy(), 
+                        metrics=Accuracy(), 
+                        inputs=inputs, 
+                        labels=labels)
+
+            callback = ModelCheckpoint(save_dir='./temp')
+            model.fit(train_dataset, batch_size=64, callbacks=callback)
+    """
+
     def __init__(self, save_freq=1, save_dir=None):
         self.save_freq = save_freq
         self.save_dir = save_dir

hapi/model.py

@@ -20,7 +20,6 @@ import pickle
 import numpy as np
 import six
 import warnings
-import tqdm
 
 from collections import Iterable
 from paddle import fluid
@@ -859,7 +858,6 @@ class Model(fluid.dygraph.Layer):
             num_workers=0,
             callbacks=None, ):
         """
-        FIXME: add more comments and usage
         Args:
             train_data (Dataset|DataLoader): An iterable data loader is used for 
                 train. An instance of paddle paddle.io.Dataset or 
@@ -897,11 +895,6 @@ class Model(fluid.dygraph.Layer):
         assert train_data is not None, \
                 "train_data must be given!"
 
-        if fluid.in_dygraph_mode():
-            feed_list = None
-        else:
-            feed_list = [x.forward() for x in self._inputs + self._labels]
-
         if isinstance(train_data, Dataset):
             train_sampler = DistributedBatchSampler(
                 train_data,
@@ -912,7 +905,6 @@ class Model(fluid.dygraph.Layer):
                 train_data,
                 batch_sampler=train_sampler,
                 places=self._place,
-                feed_list=feed_list,
                 num_workers=num_workers,
                 return_list=True)
         else:
@@ -925,7 +917,6 @@ class Model(fluid.dygraph.Layer):
                 eval_data,
                 batch_sampler=eval_sampler,
                 places=self._place,
-                feed_list=feed_list,
                 num_workers=num_workers,
                 return_list=True)
         elif eval_data is not None:
@@ -935,7 +926,7 @@ class Model(fluid.dygraph.Layer):
 
         do_eval = eval_loader is not None
         self._test_dataloader = eval_loader
-        metrics_name = self._metrics_name()
+
         steps = self._len_data_loader(train_loader)
         cbks = config_callbacks(
             callbacks,
@@ -951,26 +942,22 @@ class Model(fluid.dygraph.Layer):
         cbks.on_begin('train')
         for epoch in range(epochs):
 
-            # FIXME: adapt to DataLoader
             loader = train_loader
-            if not isinstance(train_loader, Iterable):
-                loader = train_loader()
-            logs = self._run_one_epoch(
-                loader, cbks, 'train', metrics_name, epoch=epoch)
+
+            cbks.on_epoch_begin(epoch)
+            logs = self._run_one_epoch(loader, cbks, 'train')
+            cbks.on_epoch_end(epoch, logs)
 
             if do_eval and epoch % eval_freq == 0:
-                # FIXME: adapt to DataLoader
                 loader = eval_loader
-                if not isinstance(eval_loader, Iterable):
-                    loader = eval_loader()
 
                 eval_steps = self._len_data_loader(loader)
                 cbks.on_begin('eval', {
                     'steps': eval_steps,
-                    'metrics_name': metrics_name
+                    'metrics_name': self._metrics_name()
                 })
 
-                logs = self._run_one_epoch(loader, cbks, 'eval', metrics_name)
+                logs = self._run_one_epoch(loader, cbks, 'eval')
 
                 cbks.on_end('eval', logs)
 
@@ -986,7 +973,6 @@ class Model(fluid.dygraph.Layer):
             num_workers=0,
             callbacks=None, ):
         """
-        FIXME: add more comments and usage
         Args:
             eval_data (Dataset|DataLoader): An iterable data loader is used for
                 evaluation. An instance of paddle.io.Dataset or 
@@ -1006,12 +992,55 @@ class Model(fluid.dygraph.Layer):
                 are automatically inserted. Default: None.
         Returns:
             dict: Result of metric.
-        """
 
-        if fluid.in_dygraph_mode():
-            feed_list = None
-        else:
-            feed_list = [x.forward() for x in self._inputs + self._labels]
+        Examples:
+        .. code-block:: python
+
+            # declarative mode
+            import numpy as np
+            from hapi.metrics import Accuracy
+            from hapi.datasets import MNIST
+            from hapi.vision.transforms import Compose,Resize
+            from hapi.vision.models import LeNet
+            from hapi.model import Input, set_device
+
+            
+            class MnistDataset(MNIST):
+                def __init__(self, mode, return_label=True):
+                    super(MnistDataset, self).__init__(mode=mode)
+                    self.return_label = return_label
+
+                def __getitem__(self, idx):
+                    img = np.reshape(self.images[idx], [1, 28, 28])
+                    if self.return_label:
+                        return img, np.array(self.labels[idx]).astype('int64')
+                    return img,
+
+                def __len__(self):
+                    return len(self.images)
+
+            inputs = [Input([-1, 1, 28, 28], 'float32', name='image')]
+            labels = [Input([None, 1], 'int64', name='label')]
+
+            val_dataset = MnistDataset(mode='test')
+
+            model = LeNet()
+            model.prepare(metrics=Accuracy(), inputs=inputs, labels=labels)
+
+            result = model.evaluate(val_dataset, batch_size=64)
+            print(result)
+
+            # imperative mode
+            import paddle.fluid.dygraph as dg
+            place = set_device('cpu')
+            with dg.guard(place) as g:
+                model = LeNet()
+                model.prepare(metrics=Accuracy(), inputs=inputs, labels=labels)
+
+                result = model.evaluate(val_dataset, batch_size=64)
+                print(result)
+                
+        """
 
         if eval_data is not None and isinstance(eval_data, Dataset):
             eval_sampler = DistributedBatchSampler(
@@ -1020,14 +1049,12 @@ class Model(fluid.dygraph.Layer):
                 eval_data,
                 batch_sampler=eval_sampler,
                 places=self._place,
-                feed_list=feed_list,
                 num_workers=num_workers,
                 return_list=True)
         else:
             eval_loader = eval_data
 
         self._test_dataloader = eval_loader
-        metrics_name = self._metrics_name()
 
         cbks = config_callbacks(
             callbacks,
@@ -1037,15 +1064,14 @@ class Model(fluid.dygraph.Layer):
             metrics=self._metrics_name(), )
 
         loader = eval_loader
-        if not isinstance(eval_loader, Iterable):
-            loader = eval_loader()
 
         eval_steps = self._len_data_loader(loader)
-        cbks.on_begin('eval',
-                      {'steps': eval_steps,
-                       'metrics_name': metrics_name})
+        cbks.on_begin('eval', {
+            'steps': eval_steps,
+            'metrics_name': self._metrics_name()
+        })
 
-        logs = self._run_one_epoch(loader, cbks, 'eval', metrics_name)
+        logs = self._run_one_epoch(loader, cbks, 'eval')
 
         cbks.on_end('eval', logs)
 
@@ -1061,9 +1087,9 @@ class Model(fluid.dygraph.Layer):
                 test_data,
                 batch_size=1,
                 num_workers=0,
-                stack_outputs=False):
+                stack_outputs=False,
+                callbacks=None):
         """
-        FIXME: add more comments and usage
         Args:
             test_data (Dataset|DataLoader): An iterable data loader is used for
                 predict. An instance of paddle.io.Dataset or paddle.io.Dataloader 
@@ -1082,12 +1108,53 @@ class Model(fluid.dygraph.Layer):
                 it is recommended set as True if outputs contains no LoDTensor. Default: False.
         Returns:
             list: output of models.
-        """
 
-        if fluid.in_dygraph_mode():
-            feed_list = None
-        else:
-            feed_list = [x.forward() for x in self._inputs]
+        Examples:
+        .. code-block:: python
+
+            # declarative mode
+            import numpy as np
+            from hapi.metrics import Accuracy
+            from hapi.datasets import MNIST
+            from hapi.vision.transforms import Compose,Resize
+            from hapi.vision.models import LeNet
+            from hapi.model import Input, set_device
+
+            class MnistDataset(MNIST):
+                def __init__(self, mode, return_label=True):
+                    super(MnistDataset, self).__init__(mode=mode)
+                    self.return_label = return_label
+
+                def __getitem__(self, idx):
+                    img = np.reshape(self.images[idx], [1, 28, 28])
+                    if self.return_label:
+                        return img, np.array(self.labels[idx]).astype('int64')
+                    return img,
+
+                def __len__(self):
+                    return len(self.images)
+
+            inputs = [Input([-1, 1, 28, 28], 'float32', name='image')]
+            labels = [Input([None, 1], 'int64', name='label')]
+
+            test_dataset = MnistDataset(mode='test', return_label=False)
+
+            model = LeNet()
+            model.prepare(metrics=Accuracy(), inputs=inputs, labels=labels)
+
+            result = model.predict(test_dataset, batch_size=64)
+            print(result)
+
+            # imperative mode
+            import paddle.fluid.dygraph as dg
+            place = set_device('cpu')
+            with dg.guard(place) as g:
+                model = LeNet()
+                model.prepare(metrics=Accuracy(), inputs=inputs, labels=labels)
+
+                result = model.predict(test_dataset, batch_size=64)
+                print(result)
+        """
 
         if test_data is not None and isinstance(test_data, Dataset):
             test_sampler = DistributedBatchSampler(
@@ -1096,7 +1163,6 @@ class Model(fluid.dygraph.Layer):
                 test_data,
                 batch_sampler=test_sampler,
                 places=self._place,
-                feed_list=feed_list,
                 num_workers=num_workers,
                 return_list=True)
         else:
@@ -1105,33 +1171,28 @@ class Model(fluid.dygraph.Layer):
         self._test_dataloader = test_loader
 
         loader = test_loader
-        if not isinstance(test_loader, Iterable):
-            loader = test_loader()
 
-        outputs = []
-        count = 0
-        for data in tqdm.tqdm(loader):
-            data = flatten(data)
-            out = to_list(self.test_batch(data[:len(self._inputs)]))
-            outputs.append(out)
-            count += out[0].shape[0]
+        cbks = config_callbacks(callbacks, model=self, verbose=1)
 
-        if test_loader is not None and self._adapter._nranks > 1 \
-                    and isinstance(test_loader, DataLoader) \
-                    and count > len(test_loader.dataset):
-            size = outputs[-1][0].shape[0] - (count - len(test_loader.dataset))
-            outputs[-1] = [o[:size] for o in outputs[-1]]
+        test_steps = self._len_data_loader(loader)
+        logs = {'steps': test_steps}
 
-        # NOTE: for lod tensor output, we should not stack outputs
-        # for stacking may loss its detail info
+        cbks.on_begin('test', logs)
+
+        outputs = []
+
+        logs, outputs = self._run_one_epoch(loader, cbks, 'test')
 
         outputs = list(zip(*outputs))
 
+        # NOTE: for lod tensor output, we should not stack outputs
+        # for stacking may loss its detail info
         if stack_outputs:
             outputs = [np.vstack(outs) for outs in outputs]
 
         self._test_dataloader = None
 
+        cbks.on_end('test', logs)
         return outputs
 
     def save_inference_model(self,
@@ -1179,22 +1240,8 @@ class Model(fluid.dygraph.Layer):
             params_filename=params_filename,
             program_only=program_only)
 
-    def _run_one_epoch(self,
-                       data_loader,
-                       callbacks,
-                       mode,
-                       metrics_name,
-                       epoch=None):
-        size = self._len_data_loader(data_loader)
-        logs = {
-            'steps': size,
-            'metrics_name': metrics_name,
-        }
-
-        if mode == 'train':
-            assert epoch is not None, 'when mode is train, epoch must be given'
-            callbacks.on_epoch_begin(epoch)
-
+    def _run_one_epoch(self, data_loader, callbacks, mode, logs={}):
+        outputs = []
         for step, data in enumerate(data_loader):
             # data might come from different types of data_loader and have
             # different format, as following:
@@ -1214,25 +1261,25 @@ class Model(fluid.dygraph.Layer):
                 0].shape) else data[0].shape[0]
 
             callbacks.on_batch_begin(mode, step, logs)
-            if mode == 'train':
-                outs = self.train_batch(data[:len(self._inputs)],
-                                        data[len(self._inputs):])
-            else:
-                outs = self.eval_batch(data[:len(self._inputs)],
-                                       data[len(self._inputs):])
 
-            # losses
-            loss = outs[0] if self._metrics else outs
-            metrics = [[l[0] for l in loss]]
-
-            # metrics
-            for metric in self._metrics:
-                res = metric.accumulate()
-                metrics.extend(to_list(res))
-
-            assert len(metrics_name) == len(metrics)
-            for k, v in zip(metrics_name, metrics):
-                logs[k] = v
+            if mode != 'test':
+                outs = getattr(self, mode + '_batch')(data[:len(self._inputs)],
+                                                      data[len(self._inputs):])
+                # losses
+                loss = outs[0] if self._metrics else outs
+                metrics = [[l[0] for l in loss]]
+
+                # metrics
+                for metric in self._metrics:
+                    res = metric.accumulate()
+                    metrics.extend(to_list(res))
+
+                assert len(self._metrics_name()) == len(metrics)
+                for k, v in zip(self._metrics_name(), metrics):
+                    logs[k] = v
+            else:
+                outs = getattr(self, mode + '_batch')(data)
+                outputs.append(outs)
 
             logs['step'] = step
             if mode == 'train' or self._adapter._merge_count.get(
@@ -1245,10 +1292,8 @@ class Model(fluid.dygraph.Layer):
             callbacks.on_batch_end(mode, step, logs)
         self._reset_metrics()
 
-        if mode == 'train':
-            assert epoch is not None, 'when mode is train, epoch must be given'
-            callbacks.on_epoch_end(epoch, logs)
-
+        if mode == 'test':
+            return logs, outputs
         return logs
 
     def _reset_metrics(self):

hapi/tests/test_callbacks.py

@@ -12,27 +12,43 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# when test, you should add hapi root path to the PYTHONPATH,
-# export PYTHONPATH=PATH_TO_HAPI:$PYTHONPATH
 import unittest
 import time
 import random
+import tempfile
+import shutil
 
+from hapi.model import Input
+from hapi.vision.models import LeNet
 from hapi.callbacks import config_callbacks
 
 
 class TestCallbacks(unittest.TestCase):
-    def test_callback(self):
+    def setUp(self):
+        self.save_dir = tempfile.mkdtemp()
+
+    def tearDown(self):
+        shutil.rmtree(self.save_dir)
+
+    def run_callback(self):
         epochs = 2
         steps = 50
-        freq = 1
+        freq = 2
         eval_steps = 20
+
+        lenet = LeNet()
+        inputs = [Input([None, 1, 28, 28], 'float32', name='image')]
+        lenet.prepare(inputs=inputs)
+
         cbks = config_callbacks(
+            model=lenet,
             batch_size=128,
             epochs=epochs,
             steps=steps,
-            verbose=2,
-            metrics=['loss', 'acc'], )
+            log_freq=freq,
+            verbose=self.verbose,
+            metrics=['loss', 'acc'],
+            save_dir=self.save_dir)
         cbks.on_begin('train')
 
         logs = {'loss': 50.341673, 'acc': 0.00256}
@@ -48,13 +64,12 @@ class TestCallbacks(unittest.TestCase):
 
             eval_logs = {'eval_loss': 20.341673, 'eval_acc': 0.256}
             params = {
-                'eval_steps': eval_steps,
-                'eval_metrics': ['eval_loss', 'eval_acc'],
-                'log_freq': 10,
+                'steps': eval_steps,
+                'metrics_name': ['eval_loss', 'eval_acc'],
             }
             cbks.on_begin('eval', params)
             for step in range(eval_steps):
-                cbks.on_batch_begin('eval', step, logs)
+                cbks.on_batch_begin('eval', step, eval_logs)
                 eval_logs['eval_loss'] -= random.random() * 0.1
                 eval_logs['eval_acc'] += random.random() * 0.1
                 eval_logs['batch_size'] = 2
@@ -62,8 +77,30 @@ class TestCallbacks(unittest.TestCase):
                 cbks.on_batch_end('eval', step, eval_logs)
             cbks.on_end('eval', eval_logs)
 
+            test_logs = {}
+            params = {'steps': eval_steps}
+            cbks.on_begin('test', params)
+            for step in range(eval_steps):
+                cbks.on_batch_begin('test', step, test_logs)
+                test_logs['batch_size'] = 2
+                time.sleep(0.005)
+                cbks.on_batch_end('test', step, test_logs)
+            cbks.on_end('test', test_logs)
+
         cbks.on_end('train')
 
+    def test_callback_verbose_0(self):
+        self.verbose = 0
+        self.run_callback()
+
+    def test_callback_verbose_1(self):
+        self.verbose = 1
+        self.run_callback()
+
+    def test_callback_verbose_2(self):
+        self.verbose = 2
+        self.run_callback()
+
 
 if __name__ == '__main__':
     unittest.main()