def shore_focused_loss(y_true, y_pred):
    y_true = tf.math.asinh(y_true - 4.94e-4)
    y_pred = tf.math.asinh(y_pred - 4.94e-4)
    return tf.math.reduce_mean((y_true - y_pred) ** 2)

            loss=keras.losses.MeanSquaredError()

            loss=model.shore_focused_loss