v0.2.4-alpha.6

What's Changed

• docs: updated CHANGELOG.md by @github-actions in #944
• chore: fix cuda & cudnn version in the examples by @kemingy in #951
• chore: add envd/py/ipynb linter, reformat the current files by @kemingy in #952
• example: Use torch in mnist example by @VoVAllen in #927
• chore: add more cuda version cache by @kemingy in #953

Full Changelog: v0.2.4-alpha.5...v0.2.4-alpha.6