When cv2.imwirte() saves ".gif", it will cause _error: (-2:Unspecified error) could not find a writer for the specified extension in function 'cv::imwrite_'_. We add an if statement to check whether the saving file format is ".gif" so as to avoid the error.

use pretrained_model for eval

修正拼写错误

add faq 20210322

add faq 20210316

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修改拼写错误

enable memory optim

rename language abbreviations

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* update FAQ

Release/2.0

fix label error

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