DTypeWithConstraints
class torch.ao.quantization.backend_config.DTypeWithConstraints(dtype=None, quant_min_lower_bound=None, quant_max_upper_bound=None, scale_min_lower_bound=None, scale_max_upper_bound=None, scale_exact_match=None, zero_point_exact_match=None)
Config for specifying additional constraints for a given dtype,
   such as quantization value ranges, scale value ranges, and fixed
   quantization params, to be used in "DTypeConfig".
The constraints currently supported are:


quant_min_lower_bound and quant_max_upper_bound: Lower and
     upper bounds for the minimum and maximum quantized values
     respectively. If the QConfigâs quant_min and quant_max fall
     outside this range, then the QConfig will be ignored.


scale_min_lower_bound and scale_max_upper_bound: Lower and
     upper bounds for the minimum and maximum scale values
     respectively. If the QConfigâs minimum scale value (currently

