debug EpochTimer

helpers.py

@@ -184,7 +184,7 @@ class EpochTimer(Callback):
         #   self.output = open(log_filename,'a')
         #   self.epoch = pd.read_csv(log_filename).Epoch.max()
         # else:
-        self.output = open(log_filename,'w')
+        self.output = open(log_filename,'a')
         self.output.write("{0},{1},{2},{3},{4},{5}\n".format("Epoch","Execution Time","Loss","Val_Loss","Accuracy","Accuracy_val"))
         self.output.flush()