added broadcast option to tpu

[lezwon]

What does this PR do?

Fixes # (issue)

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[pep8speaks]

Hello @lezwon! Thanks for updating this PR.

There are currently no PEP 8 issues detected in this Pull Request. Cheers! 🍻

Comment last updated at 2020-10-04 00:09:35 UTC

[codecov]

Codecov Report

Merging #3814 into master will increase coverage by 2%.
The diff coverage is 27%.

@@           Coverage Diff           @@
##           master   #3814    +/-   ##
=======================================
+ Coverage      83%     86%    +2%     
=======================================
  Files         112     112            
  Lines        8848    9186   +338     
=======================================
+ Hits         7384    7863   +479     
+ Misses       1464    1323   -141     

[williamFalcon]

i love this test!
great job!