protect progress bar callback

CHANGELOG.md

@@ -28,6 +28,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 ### Removed
 
+- Removed unintended Trainer argument `progress_bar_callback`, the callback should be passed in by `Trainer(callbacks=[...])` instead ([#1855](https://github.com/PyTorchLightning/pytorch-lightning/pull/1855))
+
 ### Fixed
 
 - Fixed user warning when apex was used together with learning rate schedulers ([#1873](https://github.com/PyTorchLightning/pytorch-lightning/pull/1873))

pytorch_lightning/trainer/callback_config.py

@@ -18,8 +18,6 @@ class TrainerCallbackConfigMixin(ABC):
     weights_save_path: str
     ckpt_path: str
     checkpoint_callback: ModelCheckpoint
-    progress_bar_refresh_rate: int
-    process_position: int
 
     @property
     @abstractmethod
@@ -109,20 +107,22 @@ def configure_early_stopping(self, early_stop_callback):
             self.early_stop_callback = early_stop_callback
             self.enable_early_stop = True
 
-    def configure_progress_bar(self):
+    def configure_progress_bar(self, refresh_rate=1, process_position=0):
         progress_bars = [c for c in self.callbacks if isinstance(c, ProgressBarBase)]
         if len(progress_bars) > 1:
             raise MisconfigurationException(
                 'You added multiple progress bar callbacks to the Trainer, but currently only one'
                 ' progress bar is supported.'
             )
         elif len(progress_bars) == 1:
-            self.progress_bar_callback = progress_bars[0]
-        elif self.progress_bar_refresh_rate > 0:
-            self.progress_bar_callback = ProgressBar(
-                refresh_rate=self.progress_bar_refresh_rate,
-                process_position=self.process_position,
+            progress_bar_callback = progress_bars[0]
+        elif refresh_rate > 0:
+            progress_bar_callback = ProgressBar(
+                refresh_rate=refresh_rate,
+                process_position=process_position,
             )
-            self.callbacks.append(self.progress_bar_callback)
+            self.callbacks.append(progress_bar_callback)
         else:
-            self.progress_bar_callback = None
+            progress_bar_callback = None
+
+        return progress_bar_callback

pytorch_lightning/trainer/deprecated_api.py

@@ -121,7 +121,7 @@ def show_progress_bar(self):
         """Back compatibility, will be removed in v0.9.0"""
         rank_zero_warn("Argument `show_progress_bar` is now set by `progress_bar_refresh_rate` since v0.7.2"
                        " and this method will be removed in v0.9.0", DeprecationWarning)
-        return self.progress_bar_refresh_rate >= 1
+        return self.progress_bar_callback and self.progress_bar_callback.refresh_rate >= 1
 
     @show_progress_bar.setter
     def show_progress_bar(self, tf):

pytorch_lightning/trainer/lr_finder.py

@@ -198,11 +198,9 @@ def __lr_finder_dump_params(self, model):
             'callbacks': self.callbacks,
             'logger': self.logger,
             'max_steps': self.max_steps,
-            'progress_bar_refresh_rate': self.progress_bar_refresh_rate,
             'checkpoint_callback': self.checkpoint_callback,
             'early_stop_callback': self.early_stop_callback,
             'enable_early_stop': self.enable_early_stop,
-            'progress_bar_callback': self.progress_bar_callback,
             'configure_optimizers': model.configure_optimizers,
         }
 
@@ -211,11 +209,9 @@ def __lr_finder_restore_params(self, model):
         self.logger = self.__dumped_params['logger']
         self.callbacks = self.__dumped_params['callbacks']
         self.max_steps = self.__dumped_params['max_steps']
-        self.progress_bar_refresh_rate = self.__dumped_params['progress_bar_refresh_rate']
         self.checkpoint_callback = self.__dumped_params['checkpoint_callback']
         self.early_stop_callback = self.__dumped_params['early_stop_callback']
         self.enable_early_stop = self.__dumped_params['enable_early_stop']
-        self.progress_bar_callback = self.__dumped_params['progress_bar_callback']
         model.configure_optimizers = self.__dumped_params['configure_optimizers']
         del self.__dumped_params
 

pytorch_lightning/trainer/trainer.py

@@ -130,7 +130,6 @@ def __init__(
             reload_dataloaders_every_epoch: bool = False,
             auto_lr_find: Union[bool, str] = False,
             replace_sampler_ddp: bool = True,
-            progress_bar_callback: Optional[Union[ProgressBarBase, bool]] = True,
             terminate_on_nan: bool = False,
             auto_scale_batch_size: Union[str, bool] = False,
             num_tpu_cores: Optional[int] = None,  # backward compatible, todo: remove in v0.9.0
@@ -364,7 +363,6 @@ def __init__(
             rank_zero_warn("num_processes is only used for distributed_backend=\"ddp_cpu\". Ignoring it.")
         self.num_processes = num_processes
 
-        self.process_position = process_position
         self.weights_summary = weights_summary
 
         self.max_epochs = max_epochs
@@ -505,9 +503,7 @@ def __init__(
         if show_progress_bar is not None:
             self.show_progress_bar = show_progress_bar
 
-        self.progress_bar_refresh_rate = progress_bar_refresh_rate
-        self.progress_bar_callback = progress_bar_callback
-        self.configure_progress_bar()
+        self._progress_bar_callback = self.configure_progress_bar(progress_bar_refresh_rate, process_position)
 
         # logging
         self.log_save_interval = log_save_interval
@@ -660,7 +656,6 @@ def add_argparse_args(cls, parent_parser: ArgumentParser) -> ArgumentParser:
              'min_steps': None,
              ...
              'profiler': None,
-             'progress_bar_callback': True,
              'progress_bar_refresh_rate': 1,
              ...}
 
@@ -755,6 +750,10 @@ def num_gpus(self) -> int:
     def data_parallel(self) -> bool:
         return self.use_dp or self.use_ddp or self.use_ddp2
 
+    @property
+    def progress_bar_callback(self):
+        return self._progress_bar_callback
+
     @property
     def progress_bar_dict(self) -> dict:
         """ Read-only for progress bar metrics. """

tests/callbacks/test_progress_bar.py

@@ -179,7 +179,7 @@ def on_test_batch_end(self, trainer, pl_module):
         num_sanity_val_steps=2,
         max_epochs=3,
     )
-    assert trainer.progress_bar_callback.refresh_rate == refresh_rate != trainer.progress_bar_refresh_rate
+    assert trainer.progress_bar_callback.refresh_rate == refresh_rate
 
     trainer.fit(model)
     assert progress_bar.train_batches_seen == 3 * progress_bar.total_train_batches

tests/trainer/test_lr_finder.py

@@ -57,9 +57,8 @@ def test_trainer_reset_correctly(tmpdir):
     )
 
     changed_attributes = ['callbacks', 'logger', 'max_steps', 'auto_lr_find',
-                          'progress_bar_refresh_rate', 'early_stop_callback',
-                          'accumulate_grad_batches', 'enable_early_stop',
-                          'checkpoint_callback']
+                          'early_stop_callback', 'accumulate_grad_batches',
+                          'enable_early_stop', 'checkpoint_callback']
     attributes_before = {}
     for ca in changed_attributes:
         attributes_before[ca] = getattr(trainer, ca)