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2f4a7177 - Fix training gradient underflow in quantization tests (#13539)

Fix training gradient underflow in quantization tests (#13539) * Fix training gradient underflow in quantization tests Change autocast dtype from float16 to bfloat16 in _test_quantization_training. Float16's limited dynamic range causes gradients to underflow to zero when passing through quantized tensor subclass operations. * fix autocast dtype check Signed-off-by: jiqing-feng <jiqing.feng@intel.com> --------- Signed-off-by: jiqing-feng <jiqing.feng@intel.com> Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>