kernels.py 文件源码

def __init__(self, length_scale=1.0, length_scale_bounds=(1e-5, 1e5)):
        if np.iterable(length_scale):
            if len(length_scale) > 1:
                self.anisotropic = True
                self.length_scale = np.asarray(length_scale, dtype=np.float)
            else:
                self.anisotropic = False
                self.length_scale = float(length_scale[0])
        else:
            self.anisotropic = False
            self.length_scale = float(length_scale)
        self.length_scale_bounds = length_scale_bounds

        if self.anisotropic:  # anisotropic length_scale
            self.hyperparameter_length_scale = \
                Hyperparameter("length_scale", "numeric", length_scale_bounds,
                               len(length_scale))
        else:
            self.hyperparameter_length_scale = \
                Hyperparameter("length_scale", "numeric", length_scale_bounds)