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Fix bug when reshaping norm output from LayerNormLinear
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* Prevent using fp8 weights + non-fp8 computation
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[PyTorch] Fix cuBLAS workspace leak in applications that initialize+destroy Userbuffers more than once (#1715)

safeguarded cuBLAS workspace expansion in initialize_ub() to avoid exponential growth across repeat initializations
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* split wgrad for GroupedLinear
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