[Dy2St] Drop legacy IR support in SOT mode

[SigureMo]

PR Category

Execute Infrastructure

PR Types

Bug fixes

Description

由于最近迭代的原因，目前 SOT+老 IR 已经跑不起来了，但是报错并不友好，因此彻底在 SOT 下禁掉老 IR，避免经常因为跑错模式而出现奇怪的报错

之所以只禁地掉 SOT 下的老 IR 是因为 SOT 不面向导出，只面向训练，而 AST 目前主要面向导出，部分场景下仍然需要，因此还不能禁掉

[paddle-bot]

你的PR提交成功，感谢你对开源项目的贡献!
请关注后续CI自动化测试结果，详情请参考Paddle-CI手册。
Your PR has been submitted. Thanks for your contribution!
Please wait for the result of CI firstly. See Paddle CI Manual for details.

[paddle-ci-bot]

Sorry to inform you that 360e176's CIs have passed for more than 7 days. To prevent PR conflicts, you need to re-run all CIs manually.

[Copilot]

Pull Request Overview

Drop legacy IR support in SOT mode by enforcing PIR mode in the symbolic translator, preventing misconfigured runs.

• Added a runtime check at the start of symbolic_translate to ensure PIR mode is enabled and raise an error otherwise.

Comments suppressed due to low confidence (1)

python/paddle/jit/sot/translate.py:91

• Add a unit test to verify that symbolic_translate raises a RuntimeError when use_pir_api() returns false, ensuring this guard is covered.

    if not paddle.framework.use_pir_api():

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Please upload report for BASE (develop@bb0cc74). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
python/paddle/jit/sot/translate.py	50.00%	1 Missing ⚠️

❌ Your patch status has failed because the patch coverage (50.00%) is below the target coverage (90.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             develop   #71520   +/-   ##
==========================================
  Coverage           ?   50.00%           
==========================================
  Files              ?        1           
  Lines              ?        2           
  Branches           ?        0           
==========================================
  Hits               ?        1           
  Misses             ?        1           
  Partials           ?        0           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[DrRyanHuang]

PIR不是已经切换成默认模式了吗？哪些case还会用到老IR呀

[SigureMo]

PIR不是已经切换成默认模式了吗？哪些case还会用到老IR呀

训练的话，一般来说没有场景，导出的话，有些用户仍然希望能够导出 .pdmodel，因此 SOT 可以禁掉，AST 还需要一段时间