Update app.py

app.py

@@ -219,5 +219,5 @@ if __name__ == "__main__":
         output_plot = gr.Plot(label="output plot")
         output_midi = gr.File(label="output midi", file_types=[".mid"])
         run_event = run_btn.click(GenerateMIDI, [input_num_tokens, input_drums, input_instrument], [output_midi_seq, output_plot, output_midi, output_audio])
-        
+        plt.close()
         app.queue(concurrency_count=1).launch(server_port=opt.port, share=opt.share, inbrowser=True)