Avoid printing ModelCheckpoint log with monitor=None and verbose=True (#6109)

CHANGELOG.md

@@ -33,6 +33,9 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - Move lightning module to correct device type when using LightningDistributedWrapper ([#6070](https://github.com/PyTorchLightning/pytorch-lightning/pull/6070))
 
 
+- Do not print top-k verbose log with `ModelCheckpoint(monitor=None)` ([#6109](https://github.com/PyTorchLightning/pytorch-lightning/pull/6109))
+
+
 - Fixed error message for AMP + CPU incompatibility ([#6107](https://github.com/PyTorchLightning/pytorch-lightning/pull/6107))
 
 

pytorch_lightning/callbacks/model_checkpoint.py

@@ -564,7 +564,7 @@ class ModelCheckpoint(Callback):
 
         if self.check_monitor_top_k(current):
             self._update_best_and_save(current, epoch, step, trainer, pl_module, metrics)
-        elif self.verbose:
+        elif self.monitor is not None and self.verbose:
             rank_zero_info(f"Epoch {epoch:d}, step {step:d}: {self.monitor} was not in top {self.save_top_k}")
 
     def _is_valid_monitor_key(self, metrics):