fix bug in tutorial (NVIDIA#3546)

Signed-off-by: Oktai Tatanov <[email protected]>

tutorials/tts/Inference_ModelSelect.ipynb

@@ -159,6 +159,9 @@
     "\n",
     "def load_spectrogram_model():\n",
     "    override_conf = None\n",
+    "    \n",
+    "    from_pretrained_call = SpectrogramGenerator.from_pretrained\n",
+    "    \n",
     "    if spectrogram_generator == \"tacotron2\":\n",
     "        from nemo.collections.tts.models import Tacotron2Model\n",
     "        pretrained_model = \"tts_en_tacotron2\"\n",
@@ -181,6 +184,7 @@
     "    elif spectrogram_generator == \"talknet\":\n",
     "        from nemo.collections.tts.models import TalkNetSpectModel\n",
     "        pretrained_model = \"tts_en_talknet\"\n",
+    "        from_pretrained_call = TalkNetSpectModel.from_pretrained\n",
     "    elif spectrogram_generator == \"fastpitch\":\n",
     "        from nemo.collections.tts.models import FastPitchModel\n",
     "        pretrained_model = \"tts_en_fastpitch\"\n",
@@ -196,7 +200,7 @@
     "    else:\n",
     "        raise NotImplementedError\n",
     "        \n",
-    "    model = SpectrogramGenerator.from_pretrained(pretrained_model, override_config_path=override_conf)\n",
+    "    model = from_pretrained_call(pretrained_model, override_config_path=override_conf)\n",
     "    \n",
     "    return model\n",
     "\n",