[keras] PlotCallback: raise evaluation batch size

keras.py

@@ -467,7 +467,7 @@ class PlotMulticlass(TFSummaryCallback):
         self.make_plots(epoch, logs)
 
     def make_plots(self, epoch, logs):
-        prediction = self.model.predict(self.x)
+        prediction = self.model.predict(self.x, batch_size=4096)
         truth = self.truth
         imgs = {}