AttributeError: 'numpy.ndarray' object has no attribute 'eval'

After training the torchMoji model on the SemEval emotion dataset, I got the following error during the evaluation to measure F1:
/torchMoji-master/torchmoji/finetuning.py in find_f1_threshold(model, val_gen, test_gen, average)
178 f1_scores = []
179
--> 180 model.eval()
181 val_out = [(y, model(X)) for X, y in val_gen]
182 y_val, y_pred_val = (list(t) for t in zip(*val_out))
AttributeError: 'numpy.ndarray' object has no attribute 'eval'

Please help me to resolve this error.