Optimize 102Flowers dataset reading speed (#31408)
* Fix slow data reading, In the old version, one epoch read time of this data set was about 5371 seconds(MacBook Pro Retina, 13-inch, Early 2015 2.7 GHz), and a batch took 211 seconds, It's too painful to use. Now decompress the data in advance (about 10 seconds). Each epoch of reading takes about 3 seconds(MacBook Pro Retina, 13-inch, Early 2015 2.7 GHz), and a batch takes 0.017 seconds more. * Run CI, test=allcase * fix qq group number. test=document_fix fix qq group number. test=document_fix * fix qq group number. test=document_fix fix qq group number. test=document_fix
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