Keras:向进度条添加变量

Question

我想监视例如.在Keras训练期间的进度条和Tensorboard中的学习率.我认为必须有一种方法来指定记录哪些变量,但在Keras 网站上没有立即澄清这个问题.

我想这与创建自定义回调函数有关,但是,应该可以修改现有的进度条回调,不是吗？

Answer 1

它可以通过自定义指标实现.以学习率为例:

def get_lr_metric(optimizer):
    def lr(y_true, y_pred):
        return optimizer.lr
    return lr

x = Input((50,))
out = Dense(1, activation='sigmoid')(x)
model = Model(x, out)

optimizer = Adam(lr=0.001)
lr_metric = get_lr_metric(optimizer)
model.compile(loss='binary_crossentropy', optimizer=optimizer, metrics=['acc', lr_metric])

# reducing the learning rate by half every 2 epochs
cbks = [LearningRateScheduler(lambda epoch: 0.001 * 0.5 ** (epoch // 2)),
        TensorBoard(write_graph=False)]
X = np.random.rand(1000, 50)
Y = np.random.randint(2, size=1000)
model.fit(X, Y, epochs=10, callbacks=cbks)

LR将打印在进度条中:

Epoch 1/10
1000/1000 [==============================] - 0s 103us/step - loss: 0.8228 - acc: 0.4960 - lr: 0.0010
Epoch 2/10
1000/1000 [==============================] - 0s 61us/step - loss: 0.7305 - acc: 0.4970 - lr: 0.0010
Epoch 3/10
1000/1000 [==============================] - 0s 62us/step - loss: 0.7145 - acc: 0.4730 - lr: 5.0000e-04
Epoch 4/10
1000/1000 [==============================] - 0s 58us/step - loss: 0.7129 - acc: 0.4800 - lr: 5.0000e-04
Epoch 5/10
1000/1000 [==============================] - 0s 58us/step - loss: 0.7124 - acc: 0.4810 - lr: 2.5000e-04
Epoch 6/10
1000/1000 [==============================] - 0s 63us/step - loss: 0.7123 - acc: 0.4790 - lr: 2.5000e-04
Epoch 7/10
1000/1000 [==============================] - 0s 61us/step - loss: 0.7119 - acc: 0.4840 - lr: 1.2500e-04
Epoch 8/10
1000/1000 [==============================] - 0s 61us/step - loss: 0.7117 - acc: 0.4880 - lr: 1.2500e-04
Epoch 9/10
1000/1000 [==============================] - 0s 59us/step - loss: 0.7116 - acc: 0.4880 - lr: 6.2500e-05
Epoch 10/10
1000/1000 [==============================] - 0s 63us/step - loss: 0.7115 - acc: 0.4880 - lr: 6.2500e-05

然后,您可以在TensorBoard中可视化LR曲线.

Answer 2

如何将自定义值传递给 TensorBoard 的另一种方法（实际上是鼓励的）是通过子keras.callbacks.TensorBoard类化。这允许您应用自定义函数来获取所需的指标并将它们直接传递给 TensorBoard。

以下是Adam优化器学习率的示例：

class SubTensorBoard(TensorBoard):
    def __init__(self, *args, **kwargs):
        super(SubTensorBoard, self).__init__(*args, **kwargs)

    def lr_getter(self):
        # Get vals
        decay = self.model.optimizer.decay
        lr = self.model.optimizer.lr
        iters = self.model.optimizer.iterations # only this should not be const
        beta_1 = self.model.optimizer.beta_1
        beta_2 = self.model.optimizer.beta_2
        # calculate
        lr = lr * (1. / (1. + decay * K.cast(iters, K.dtype(decay))))
        t = K.cast(iters, K.floatx()) + 1
        lr_t = lr * (K.sqrt(1. - K.pow(beta_2, t)) / (1. - K.pow(beta_1, t)))
        return np.float32(K.eval(lr_t))

    def on_epoch_end(self, episode, logs = {}):
        logs.update({"lr": self.lr_getter()})
        super(SubTensorBoard, self).on_epoch_end(episode, logs)