PR #32847: Add a unit test for training and validation callbacks

Imported from GitHub PR #32847

The test is to check that the progress bar shown Keras during the training process is working properly when training and validating with inputs of unknown sizes.

Copybara import of the project:

  - 391206709057bedcadb511e305012de801c5992d Add a unit test for training and validation callbacks by Ivan Ukhov <ivan.ukhov@gmail.com>
  - 2f4d26ba6a99a04c974b83a572430d5684759f05 Merge 391206709057bedcadb511e305012de801c5992d into 18f70... by Ivan Ukhov <ivan.ukhov@gmail.com>

COPYBARA_INTEGRATE_REVIEW=https://github.com/tensorflow/tensorflow/pull/32847 from IvanUkhov:shared-callbacks 391206709057bedcadb511e305012de801c5992d
PiperOrigin-RevId: 272958417
1 file changed
tree: 26088eb48a6e9bb2b6d870dccfd7773b285e3e7d
  1. .github/
  2. tensorflow/
  3. third_party/
  4. tools/
  5. .bazelrc
  6. .gitignore
  7. ACKNOWLEDGMENTS
  8. ADOPTERS.md
  9. arm_compiler.BUILD
  10. AUTHORS
  11. BUILD
  12. CODE_OF_CONDUCT.md
  13. CODEOWNERS
  14. configure
  15. configure.cmd
  16. configure.py
  17. CONTRIBUTING.md
  18. ISSUE_TEMPLATE.md
  19. ISSUES.md
  20. LICENSE
  21. models.BUILD
  22. README.md
  23. RELEASE.md
  24. SECURITY.md
  25. WORKSPACE
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