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Add env to chose blocklen of blockwise quantize.
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* Reapply "Allow NVTEShape to own data." (#1703)

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Introduce nvte_memset to provide a fill kernel that is faster than cudaMemsetAsync for small sizes (#1716)

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Revert "Allow NVTEShape to own data. (#1674)"

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* Blockwise float8 quantizer and quantized tensor class.

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