Ordinary CNN (not LSTM), Batch size 1, dataset size is about 40k, these curves are at about epoch 8th. Any one experienced these strange curves, i.e., fluctuating dramatically in a period, especially the valid_acc. Batch size?
strange_curve.png1380×1006 161 KB

here is the training acc curves

train_acc.png1398×478 90.8 KB