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[PyTorch] fix input_quantizer usage for save_original_input; fix blockwise FP8 convert_and_update_tensor (#1978)

* fix input_quantizer in save_original_input bwd
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* fix get shape of blockwise tensor with only compact colwise data
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* fix blockwise FP8 convert_and_update_tensor
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* fix bug if all values<0
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* minor fix
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* Fix bug when constructing FP8 tensor
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* Add quantize function to C++ quantizers
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* Prototype function to coerce Python quantized tensors to match quantizer
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* Add FP8 current scaling support for activation backward
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* Use consistent shapes for FP8 transposes
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