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warm_start for SGD #75

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warm_start for SGD #75

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38 changes: 28 additions & 10 deletions fastFM/ffm.pyx
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Original file line number Diff line number Diff line change
Expand Up @@ -128,11 +128,20 @@ def ffm_sgd_fit(fm, X, double[:] y):
pt_param = <cffm.ffm_param *> PyCapsule_GetPointer(param, "FFMParam")

# allocate the coefs
cdef double w_0 = 0
cdef np.ndarray[np.float64_t, ndim=1, mode='c'] w =\
np.zeros(n_features, dtype=np.float64)
cdef np.ndarray[np.float64_t, ndim=2, mode='c'] V =\
np.zeros((fm.rank, n_features), dtype=np.float64)
# allocate the coefs
cdef double w_0
cdef np.ndarray[np.float64_t, ndim=1, mode='c'] w
cdef np.ndarray[np.float64_t, ndim=2, mode='c'] V

if fm.warm_start:
w_0 = 0 if fm.ignore_w_0 else fm.w0_
w = np.zeros(n_features, dtype=np.float64) if fm.ignore_w else fm.w_
V = np.zeros((fm.rank, n_features), dtype=np.float64)\
if fm.rank == 0 else fm.V_
else:
w_0 = 0
w = np.zeros(n_features, dtype=np.float64)
V = np.zeros((fm.rank, n_features), dtype=np.float64)

cffm.ffm_sgd_fit(&w_0, <double *> w.data, <double *> V.data,
pt_X, &y[0], pt_param)
Expand All @@ -147,11 +156,20 @@ def ffm_fit_sgd_bpr(fm, X, np.ndarray[np.float64_t, ndim=2, mode='c'] pairs):
pt_param = <cffm.ffm_param *> PyCapsule_GetPointer(param, "FFMParam")

#allocate the coefs
cdef double w_0 = 0
cdef np.ndarray[np.float64_t, ndim=1, mode='c'] w =\
np.zeros(n_features, dtype=np.float64)
cdef np.ndarray[np.float64_t, ndim=2, mode='c'] V =\
np.zeros((fm.rank, n_features), dtype=np.float64)
# allocate the coefs
cdef double w_0
cdef np.ndarray[np.float64_t, ndim=1, mode='c'] w
cdef np.ndarray[np.float64_t, ndim=2, mode='c'] V

if fm.warm_start:
w_0 = 0 if fm.ignore_w_0 else fm.w0_
w = np.zeros(n_features, dtype=np.float64) if fm.ignore_w else fm.w_
V = np.zeros((fm.rank, n_features), dtype=np.float64)\
if fm.rank == 0 else fm.V_
else:
w_0 = 0
w = np.zeros(n_features, dtype=np.float64)
V = np.zeros((fm.rank, n_features), dtype=np.float64)

cffm.ffm_sgd_bpr_fit(&w_0, <double *> w.data, <double *> V.data,
pt_X, <double *> pairs.data, pairs.shape[0], pt_param)
Expand Down