orff.py 文件源码

def _get_kernel(self, X, y):
        # When adding a new kernel, update this table and the _get_kernel_map
        # method
        if callable(self.ovkernel):
            ov_kernel = self.ovkernel
        elif isinstance(self.ovkernel, str):
            # 1) check string and assign the right parameters
            if self.ovkernel == 'DGauss':
                self.A_ = self._default_decomposable_op(y)
                kernel_params = {'A': self.A_, 'scalar_kernel': rbf_kernel,
                                 'scalar_kernel_params': {'gamma': self.gamma}}
            elif self.ovkernel == 'DSkewed_chi2':
                self.A_ = self._default_decomposable_op(y)
                kernel_params = {'A': self.A_, 'scalar_kernel': 'skewed_chi2',
                                 'scalar_kernel_params': {'skew': self.skew}}
            elif self.ovkernel == 'CurlF':
                kernel_params = {'gamma': self.gamma}
            else:
                raise NotImplementedError('unsupported kernel')
            # 2) Uses lookup table to select the right kernel from string
            ov_kernel = \
                PAIRWISE_KERNEL_FUNCTIONS[self.ovkernel](**kernel_params)
        else:
            raise NotImplementedError('unsupported kernel')
        return ov_kernel