[BUG] [tf.keras] BLSTM NER overfitting while 0.2.1 works just fine

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Environment

• OS [e.g. Mac OS, Linux]: Colab

Issue Description

I have tried 0.2.1 version and tf.keras version for ChineseNER task, found that tf.keras version perform very badly. 0.21 val loss will reduce during training, but tf.keras only reduce the training loss.

What

0.2.1 perfomance

Epoch 1/200
41/41 [==============================] - 159s 4s/step - loss: 0.2313 - acc: 0.9385 - val_loss: 0.0699 - val_acc: 0.9772
Epoch 2/200
41/41 [==============================] - 277s 7s/step - loss: 0.0563 - acc: 0.9823 - val_loss: 0.0356 - val_acc: 0.9892
Epoch 3/200
41/41 [==============================] - 309s 8s/step - loss: 0.0361 - acc: 0.9887 - val_loss: 0.0243 - val_acc: 0.9928
Epoch 4/200
41/41 [==============================] - 242s 6s/step - loss: 0.0297 - acc: 0.9905 - val_loss: 0.0228 - val_acc: 0.9927
Epoch 5/200
41/41 [==============================] - 328s 8s/step - loss: 0.0252 - acc: 0.9920 - val_loss: 0.0196 - val_acc: 0.9938
Epoch 6/200
 4/41 [=>............................] - ETA: 4:37 - loss: 0.0234 - acc: 0.9926

tf.keras performance

Epoch 1/200
Epoch 1/200
5/5 [==============================] - 5s 1s/step - loss: 2.3491 - acc: 0.9712
42/42 [==============================] - 115s 3s/step - loss: 2.9824 - acc: 0.9171 - val_loss: 2.3491 - val_acc: 0.9712
Epoch 2/200
5/5 [==============================] - 4s 768ms/step - loss: 2.9726 - acc: 0.9822
42/42 [==============================] - 107s 3s/step - loss: 0.1563 - acc: 0.9952 - val_loss: 2.9726 - val_acc: 0.9822
Epoch 3/200
5/5 [==============================] - 4s 773ms/step - loss: 3.0985 - acc: 0.9833
42/42 [==============================] - 107s 3s/step - loss: 0.0482 - acc: 0.9994 - val_loss: 3.0985 - val_acc: 0.9833
Epoch 4/200
5/5 [==============================] - 4s 771ms/step - loss: 3.2479 - acc: 0.9833
42/42 [==============================] - 107s 3s/step - loss: 0.0247 - acc: 0.9997 - val_loss: 3.2479 - val_acc: 0.9833
Epoch 5/200
5/5 [==============================] - 4s 766ms/step - loss: 3.3612 - acc: 0.9839
42/42 [==============================] - 107s 3s/step - loss: 0.0156 - acc: 0.9998 - val_loss: 3.3612 - val_acc: 0.9839

Reproduce

Here is the colab notebook for reproduce this issue

• tf.keras-colab

• 0.2.1 colab

[BrikerMan]

Good news guys, fixed. After 10 epoch with 64 batch-size, here is the result.

embedding = BERTEmbedding('/input0/BERT/chinese_L-12_H-768_A-12',
                          task=kashgari.LABELING,
                          sequence_length=100,
                          layer_nums=4)
model = BLSTMModel(embedding)
model.fit(train_x,
          train_y,
          valid_x,
          valid_y,
          batch_size=64,
          epochs=10)
model.evaluate(test_x, test_y, batch_size=512)

           precision    recall  f1-score   support

      LOC     0.9265    0.9370    0.9317      3431
      ORG     0.8364    0.8808    0.8580      2147
      PER     0.9644    0.9644    0.9644      1797

micro avg     0.9084    0.9273    0.9177      7375
macro avg     0.9095    0.9273    0.9182      7375

[alexwwang]

Good to know!

On Wed, 10 Jul 2019 at 18:30, hahahu [e-mail] wrote:

Cheers!

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