Staging/hi itn v3

[mgrafu]

What does this PR do ?

Add a one line overview of what this PR aims to accomplish.

Before your PR is "Ready for review"

Pre checks:

• Have you signed your commits? Use git commit -s to sign.
• Do all unittests finish successfully before sending PR?
  1. pytest or (if your machine does not have GPU) pytest --cpu from the root folder (given you marked your test cases accordingly @pytest.mark.run_only_on('CPU')).
  2. Sparrowhawk tests bash tools/text_processing_deployment/export_grammars.sh --MODE=test ...
• If you are adding a new feature: Have you added test cases for both pytest and Sparrowhawk here.
• Have you added __init__.py for every folder and subfolder, including data folder which has .TSV files?
• Have you followed codeQL results and removed unused variables and imports (report is at the bottom of the PR in github review box) ?
• Have you added the correct license header Copyright (c) 2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved. to all newly added Python files?
• If you copied nemo_text_processing/text_normalization/en/graph_utils.py your header's second line should be Copyright 2015 and onwards Google, Inc.. See an example here.
• Remove import guards (try import: ... except: ...) if not already done.
• If you added a new language or a new feature please update the NeMo documentation (lives in different repo).
• Have you added your language support to tools/text_processing_deployment/pynini_export.py.

PR Type:

• New Feature
• Bugfix
• Documentation
• Test

If you haven't finished some of the above items you can still open "Draft" PR.

[folivoramanh]

Reviewed this as an integration PR rather than re-litigating the eight feature PRs it carries. Full Hindi suite passes 1230/1230 on the merge result, which covers the unchecked unit-test box in the description.

Integration checks are clean:

• Nothing from main is lost — git log main ^HEAD is empty, so the branch is fully current after 18d10e83. Only inverse_normalize.py changes outside hi/ (+15/-0), and the Jenkinsfile keeps main's JA_/KO_ cache bumps while bumping HI_TN_CACHE.
• Sparrowhawk wiring is complete — 15 testITN* entries with 15 matching test_cases_*.txt, including the three new classes (electronic, roman, serial).
• The new post_process hook is genuinely applied, not dead code — hi is already in the hardcoded ["en", "hi", "ja", "vi"] list in normalize.py, and the flag toggles as intended:

  मुझे एक सौ रुपये चाहिए ।   post_process=True  -> मुझे ₹१०० चाहिए।
                             post_process=False -> मुझे ₹१०० चाहिए ।
  

should-fix · verified — nemo_text_processing/inverse_text_normalization/hi/data/electronic/__init__.py and nemo_text_processing/inverse_text_normalization/hi/data/serial/__init__.py are both 0 bytes, while every sibling carries the licence header (hi/data/numbers/__init__.py is 610 bytes, starting # Copyright (c) 2024, NVIDIA CORPORATION.). CONTRIBUTING requires the header on every new Python file, and these are the only two added .py files missing it. (Commenting here rather than inline because an empty added file has no diff hunk to anchor to.)