WBCE
4 years ago in Python
EIGHT_UNBALANCE = 37
def weighted_binary_crossentropy(y_true, y_pred):
# Calculate the binary crossentropy
b_ce = K.binary_crossentropy(y_true, y_pred)
# Apply the weights
weight_vector = (y_true * WEIGHT_UNBALANCE + (1.-y_true)) / 2.
weighted_b_ce = weight_vector * b_ce
return K.mean(weighted_b_ce,axis=-1)