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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)
ctypedef np.float64_t DOUBLE
ctypedef np.int32_t INTEGER
cdef class WeightVector(object):
cdef np.ndarray w
cdef DOUBLE *w_data_ptr
cdef double wscale
cdef Py_ssize_t n_features
cdef double sq_norm
cdef void add(self, DOUBLE *x_data_ptr, INTEGER *x_ind_ptr,
int xnnz, double c)
cdef double dot(self, DOUBLE *x_data_ptr, INTEGER *x_ind_ptr,
int xnnz)
cdef void scale(self, double c)
cdef void reset_wscale(self)
cdef double norm(self)
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