Disable LR reporting due to reporting bug.

PiperOrigin-RevId: 304315213

Author: saberkun

official/vision/image_classification/callbacks.py

@@ -128,8 +128,9 @@ def on_epoch_end(self,
 
   def _calculate_metrics(self) -> MutableMapping[str, Any]:
     logs = {}
-    if self._track_lr:
-      logs['learning_rate'] = self._calculate_lr()
+    # TODO(b/149030439): disable LR reporting.
+    # if self._track_lr:
+    #   logs['learning_rate'] = self._calculate_lr()
     return logs
 
   def _calculate_lr(self) -> int: