def mlm_loss(y_true, y_pred):
a = tf.keras.backend.constant(1, dtype='float32')
for s in range(batch_size): # for each sample in batch
    for i in range(L):
        for j in range(L):
            loss=loss + y_true[s][i]*(a-y_true[s][j])*(a-(y_pred[s][i]-y_pred[s][j])) #two conditions
l= tf.keras.backend.constant(L, dtype='float32')            
return loss
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