The kernel appears to have died. It will restart automatically问题

用jupyter notebook 运行教程中下面这个cell时，总会报"The kernel appears to have died. It will restart automatically"错误。

params = {'n_trees': 50,'max_depth': 3,'n_batches_per_layer': 1,# You must enable center_bias = True to get DFCs. This will force the model to # make an initial prediction before using any features (e.g. use the mean of # the training labels for regression or log odds for classification when# using cross entropy loss).'center_bias': True
}est = tf.estimator.BoostedTreesClassifier(feature_columns, **params)
est.train(train_input_fn, max_steps=100)
results = est.evaluate(eval_input_fn)
pd.Series(results).to_frame()

在网上搜了一圈后，大致有两种原因：

OOM：OUT OF MEMORY
软件版本不一致

但是基于训练数据只有30k, 627条，我首先排除了OOM的可能行，把可能相关的包更新了一遍，然而这个错还在。
最终在fast.ai论坛上找到了解决方法：

Alex.Nikitin Alexander
Hi! Had the same issue on AWS P2.xlarge. Choosing lower batch size from the beginning should help.

因为数据量小，源代码将所有数据直接作为一个batch，将batch_size改小后，it works for me too!

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