[dv/mubi] Fix randomization

This changes the distributions for mubi values to be more uniform.
The true and false values weights are scaled to the others become
uniform.

The distributions for 400000 values of mubi4 with weights
False=4, True=2, Others=2 become more uniform: a measurement gives

mubi 00000000 count 0.017827
mubi 00000001 count 0.017930
mubi 00000002 count 0.017708
mubi 00000003 count 0.017695
mubi 00000004 count 0.017825
mubi 00000005 count 0.499032
mubi 00000006 count 0.017642
mubi 00000007 count 0.018132
mubi 00000008 count 0.017825
mubi 00000009 count 0.017962
mubi 0000000a count 0.250962
mubi 0000000b count 0.018163
mubi 0000000c count 0.018027
mubi 0000000d count 0.017687
mubi 0000000e count 0.017718
mubi 0000000f count 0.017862

The previous code's measurement is shown in the linked issue.

Fixes #10257

Signed-off-by: Guillermo Maturana <maturana@google.com>
2 files changed
tree: 6fe083200969e2324db69cfe2b6c059d338b347a
  1. .github/
  2. ci/
  3. doc/
  4. hw/
  5. rules/
  6. site/
  7. sw/
  8. test/
  9. third_party/
  10. util/
  11. .bazelignore
  12. .bazelrc
  13. .bazelversion
  14. .clang-format
  15. .dockerignore
  16. .flake8
  17. .gitignore
  18. .style.yapf
  19. .svlint.toml
  20. .svls.toml
  21. _index.md
  22. apt-requirements.txt
  23. azure-pipelines.yml
  24. BUILD
  25. check_tool_requirements.core
  26. CLA
  27. COMMITTERS
  28. CONTRIBUTING.md
  29. LICENSE
  30. meson.build
  31. meson_init.sh
  32. meson_options.txt
  33. python-requirements.txt
  34. README.md
  35. tool_requirements.py
  36. toolchain.txt
  37. topgen-reg-only.core
  38. topgen.core
  39. WORKSPACE
  40. yum-requirements.txt
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