luna_p2.py 文件源码

def build_objective(model, deterministic=False, epsilon=1e-12):
    predictions = T.flatten(nn.layers.get_output(model.l_out))
    targets = T.flatten(nn.layers.get_output(model.l_target))
    dice = (2. * T.sum(targets * predictions) + epsilon) / (T.sum(predictions) + T.sum(targets) + epsilon)
    return -1. * dice