3. Embedding
3.1 Embedding
unq_categories = ['music', 'movie', 'finance', 'game', 'military', 'history']
id_mapping = layer = tf.keras.layers.StringLookup(vocabulary=unq_categories)
emb_layer = tf.keras.layers.Embedding(input_dim=len(unq_categories) + 1, output_dim=4)3.2 共享 or 独占
3.3 Parameter Server 训练加速器
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