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Hi @dlutleixin
Nowadays, figuring out the most appropriate structure of NN has been a challenge task. Usually, for language understanding task, we'll use LSTM (good at capturing global long-term dependencies). For text classification, we'll use CNN (good at captures local n-gram information). As for different word embeddings like word2vec, glove or fasttext, it is also hard to figure out which one is better. But among in them, I think fasttext is better since it can capture character information, making it better in handling out-of-vocabulary (rare) words.
It is worth noting that, recently, there has been novel architectures proposed like self-attention + convolution for question answering domain (QANet), which captures both advantages of CNN and LSTM. Also for word embeddings, there has been also a state-of-the-art embeddings that both capture context and character information, called "ELMo".
In summary, if you don't know which kind of NN or embeddings to use, I recommend you to read papers for further learning. But if you're in a competition like Kaggle, many people will try to ensemble them all in order to boost the performance.
Cheers.
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