fix server tests and pylint

tests/test_demo_server.py

@@ -20,5 +20,6 @@ class DemoServerTest(unittest.TestCase):
     def test_in_out(self):
         self._create_random_model()
         config = load_config(os.path.join(get_tests_input_path(), 'server_config.json'))
+        config['tts_path'] = get_tests_output_path()
         synthesizer = Synthesizer(config)
         synthesizer.tts("Better this test works!!")

utils/visual.py

@@ -32,7 +32,7 @@ def plot_spectrogram(linear_output, audio, fig_size=(16, 10)):
         linear_output_ = linear_output.detach().cpu().numpy().squeeze()
     else:
         linear_output_ = linear_output
-    spectrogram = audio._denormalize(linear_output_)
+    spectrogram = audio._denormalize(linear_output_)  # pylint: disable=protected-access
     fig = plt.figure(figsize=fig_size)
     plt.imshow(spectrogram.T, aspect="auto", origin="lower")
     plt.colorbar()