Fix false positive tracer leaks in flax library. #4232
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We'd like flax itself never to accidentally trigger the jax leak detector when enabled, but over the years a few longer-lived temporaries were introduced to the flax codebase that do trigger it. We remedy those cases: - in flax.core remove a redundant use of nonlocal scopes in pack implementation. - for nn.jit have the hashing helper datastructure maintain a weakref to module. - explicitly exempt a context capture used in module summary tabulation routine. PiperOrigin-RevId: 680626207
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Fix false positive tracer leaks in flax library.
We'd like flax itself never to accidentally trigger the jax leak detector when enabled,
but over the years a few longer-lived temporaries were introduced to the flax codebase
that do trigger it. We remedy those cases: