Wing Lian 00dee05fc6 support flattening/packing for GRPO (#3552) ...

* support flattening/packing for GRPO

* more flattening

* fix tests

* improve dead vllm handling

* refactor out process handling for vllm serve and move bench flattening tests to gpu tests

* add validation for flattening with liger

* isolate batch flattening test

* flaky test

2026-03-28 13:15:54 -04:00

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