drop the support of pytorch 1.6.x #4105
Description
Is your feature request related to a problem? Please describe.
drop all the tests for pytorch 1.6.x, mainly for the updated __torch_function__ API since 1.7.
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Is your feature request related to a problem? Please describe.
drop all the tests for pytorch 1.6.x, mainly for the updated __torch_function__ API since 1.7.