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Provide access to average loss values from each epoch #624

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Provide access to average loss values from each epoch #624

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ccca3a3
Replace l-value macros as per PEP 674.
Jan 8, 2022
9af754b
Store average loss values for users' benefit.
Jan 8, 2022
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12 changes: 12 additions & 0 deletions lightfm/_lightfm_fast.pyx.template
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Original file line number Diff line number Diff line change
Expand Up @@ -213,6 +213,9 @@ cdef class FastLightFM:
cdef double item_scale
cdef double user_scale

cdef readonly double avg_loss
cdef int avg_loss_ctr

def __init__(self,
flt[:, ::1] item_features,
flt[:, ::1] item_feature_gradients,
Expand Down Expand Up @@ -258,6 +261,9 @@ cdef class FastLightFM:

self.max_sampled = max_sampled

self.avg_loss = 0.0
self.avg_loss_ctr = 0


cdef inline flt sigmoid(flt v) nogil:
"""
Expand Down Expand Up @@ -533,6 +539,9 @@ cdef inline void update(double loss,
lightfm.item_scale *= (1.0 + item_alpha * avg_learning_rate)
lightfm.user_scale *= (1.0 + user_alpha * avg_learning_rate)

lightfm.avg_loss_ctr += 1
lightfm.avg_loss = (lightfm.avg_loss * (lightfm.avg_loss_ctr - 1) + loss) / lightfm.avg_loss_ctr


cdef void warp_update(double loss,
CSRMatrix item_features,
Expand Down Expand Up @@ -648,6 +657,9 @@ cdef void warp_update(double loss,
lightfm.item_scale *= (1.0 + item_alpha * avg_learning_rate)
lightfm.user_scale *= (1.0 + user_alpha * avg_learning_rate)

lightfm.avg_loss_ctr += 1
lightfm.avg_loss = (lightfm.avg_loss * (lightfm.avg_loss_ctr - 1) + loss) / lightfm.avg_loss_ctr


cdef void regularize(FastLightFM lightfm,
double item_alpha,
Expand Down