[doc] refine pretrained model links #1006
Merged
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We used to provide checkpoint model, runtime x86 model, runtime android model. However, runtime model could be used in both x86 and android, which is tricky for some users.
So we combine them into one quantized model in this PR, which reduces the model size, network traffic, as well as maintainance efforts. And our experiments shows, quantized models show comparable accuracy and better RTF compared with corresponding float model on both x86 and android platforms.