[keras] PlotMulticlass kwarg

keras.py

@@ -483,7 +483,7 @@ class PlotMulticlass(TFSummaryCallback):
         plt.close("all")
         gc.collect()
 
-    def make_eval_plots(self, epoch):
+    def make_eval_plots(self, epoch=0):
         prediction = self.model.predict(self.x, batch_size=4096)
         truth = self.truth
         imgs = {}