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Fix ESPnet2-TTS Colab Notebook: Update dependencies & ensure correct synthesis setup

This commit addresses three key issues in the ESPnet2-TTS realtime demonstration notebook:

  • Fixed outdated SciPy import: Updated the installation step to use the 202412 version of ESPnet2, resolving an outdated kaiser import issue.
  • Ensured nltk dataset availability: Added a condition in the "Model Setup" section to automatically download the required dataset before English synthesis.
  • Resolved Japanese synthesis dependency issue: Introduced an additional condition to ensure pyopenjtalk is installed before running Japanese synthesis.

These fixes improve first-time usability by preventing common dependency errors in the notebook.

References:
Fixes #6061, #6062, #6063.

Fix ESPnet2-TTS Colab Notebook: Update dependencies & ensure correct synthesis setup

This commit addresses three key issues in the ESPnet2-TTS realtime demonstration notebook:

- Fixed outdated SciPy import: Updated the installation step to use the 202412 version of ESPnet2, resolving an outdated kaiser import issue.

- Ensured nltk dataset availability: Added a condition in the "Model Setup" section to automatically download the required dataset before English synthesis.

- Resolved Japanese synthesis dependency issue: Introduced an additional condition to ensure pypopenjtalk is installed before running Japanese synthesis.

These fixes improve first-time usability by preventing common dependency errors in the notebook.
@JustinSabatini
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This PR addresses dependency issues in the ESPnet2-TTS Colab notebook (#6061, #6062, #6063). It looks like the pre-commit.ci check failed, but my changes are unrelated to code formatting or CI configurations. Let me know if anything needs adjusting!

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