访问弃用的属性"validation_data"；在tf.keras.callbacks.Callback中 [英] Access deprecated attribute "validation_data" in tf.keras.callbacks.Callback

问题描述

我决定从keras切换到tf.keras(建议

I decided to switch from keras to tf.keras (as recommended here). Therefore I installed tf.__version__=2.0.0 and tf.keras.__version__=2.2.4-tf. In an older version of my code (using some older Tensorflow version tf.__version__=1.x.x) I used a callback to compute custom metrics on the entire validation data at the end of each epoch. The idea to do so was taken from here. However, it seems as if the "validation_data" attribute is deprecated so that the following code is not working any longer.

class ValMetrics(Callback):

    def on_train_begin(self, logs={}):

        self.val_all_mse = []

    def on_epoch_end(self, epoch, logs):

        val_predict = np.asarray(self.model.predict(self.validation_data[0]))
        val_targ = self.validation_data[1]

        val_epoch_mse = mse_score(val_targ, val_predict)

        self.val_epoch_mse.append(val_epoch_mse)

        # Add custom metrics to the logs, so that we can use them with
        # EarlyStop and csvLogger callbacks
        logs["val_epoch_mse"] = val_epoch_mse

        print(f"\nEpoch: {epoch + 1}")
        print("-----------------")
        print("val_mse:     {:+.6f}".format(val_epoch_mse))

        return

以下是我当前的解决方法.我只是将validation_data作为ValMetrics类的参数:

My current workaround is the following. I simply gave validation_data as an argument to the ValMetrics class :

class ValMetrics(Callback):

    def __init__(self, validation_data):
        super(Callback, self).__init__()
        self.X_val, self.y_val = validation_data

仍然有一些问题:是否确实不赞成使用"validation_data"属性，或者可以在其他位置找到它?与上述解决方法相比，在每个时期结束时是否有更好的方法来访问验证数据?

Still I have some questions: Is the "validation_data" attribute really deprecated or can it be found elsewhere? Is there a better way to access the validation data at the end of each epoch than with the above workaround?

非常感谢！

推荐答案

您正确的认为，根据您面临的问题已在Github中提出.相关问题是问题1 ，问题3 .

The issue which you are facing has been raised in Github. Related issues are Issue1, Issue2 and Issue3.

以上所有Github问题均未解决，按照此

None of the above Github Issues is resolved and Your workaround of passing Validation_Data as an argument to Custom Callback is a good one, as per this Github Comment, as many people found it useful.

为Stackoverflow Community的利益指定以下变通方法代码，即使它存在于Github中.

Specifying the code of workaround below, for the benefit of the Stackoverflow Community, even though it is present in Github.

class Metrics(Callback):

    def __init__(self, val_data, batch_size = 20):
        super().__init__()
        self.validation_data = val_data
        self.batch_size = batch_size

    def on_train_begin(self, logs={}):
        print(self.validation_data)
        self.val_f1s = []
        self.val_recalls = []
        self.val_precisions = []

    def on_epoch_end(self, epoch, logs={}):
        batches = len(self.validation_data)
        total = batches * self.batch_size

        val_pred = np.zeros((total,1))
        val_true = np.zeros((total))

        for batch in range(batches):
            xVal, yVal = next(self.validation_data)
            val_pred[batch * self.batch_size : (batch+1) * self.batch_size] = np.asarray(self.model.predict(xVal)).round()
            val_true[batch * self.batch_size : (batch+1) * self.batch_size] = yVal

        val_pred = np.squeeze(val_pred)
        _val_f1 = f1_score(val_true, val_pred)
        _val_precision = precision_score(val_true, val_pred)
        _val_recall = recall_score(val_true, val_pred)

        self.val_f1s.append(_val_f1)
        self.val_recalls.append(_val_recall)
        self.val_precisions.append(_val_precision)

        return

我将继续关注上述Github问题，并会相应地更新答案.

I will keep following the Github Issues mentioned above and will update the Answer accordingly.

希望这会有所帮助.学习愉快！

Hope this helps. Happy Learning!

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