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"""Efficient (dense) parameter vector implementation for linear models. """
cimport numpy as np
cdef extern from "math.h":
cdef extern double sqrt(double x)
cdef class WeightVector(object):
cdef np.ndarray w
cdef np.ndarray aw
cdef double *w_data_ptr
cdef double *aw_data_ptr
cdef double wscale
cdef double average_a
cdef double average_b
cdef int n_features
cdef double sq_norm
cdef void add(self, double *x_data_ptr, int *x_ind_ptr,
int xnnz, double c) nogil
cdef void add_average(self, double *x_data_ptr, int *x_ind_ptr,
int xnnz, double c, double num_iter) nogil
cdef double dot(self, double *x_data_ptr, int *x_ind_ptr,
int xnnz) nogil
cdef void scale(self, double c) nogil
cdef void reset_wscale(self) nogil
cdef double norm(self) nogil
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