Number of mantissa bits to take into account for hashing floats. This option is read-only for a trained model.
mantissa_nbits value, should be non-negative and
less than or equal to
52, that is a number of
mantissa bits in a C++ 64-bit
The exception is raised when
trying to change this option for a model that has already been trained;
new_mantissa_nbitsvalue is negative or larger than