Reducing the running time of tests

[sleepy-owl]

Hi,

I updated the number of samples in test_t in test_distributions.py which reduces the running time of the test from ~59s to ~19s on my local machine. I also verified that the test passes on multiple seeds.

Would you guys be interested in such optimizations? If yes, I can help contribute more and look at how to optimize other expensive tests in the test suite. Please let me know if you have any other suggestions or any necessary checks that I should do on these tests.

Thanks!

[codecov]

Codecov Report

Merging #3823 into master will increase coverage by 0.31%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3823      +/-   ##
==========================================
+ Coverage   90.45%   90.76%   +0.31%     
==========================================
  Files         133      133              
  Lines       20566    20566              
==========================================
+ Hits        18603    18667      +64     
+ Misses       1963     1899      -64     

Impacted Files	Coverage Δ
pymc3/distributions/continuous.py	80.85% <0.00%> (+0.40%)	⬆️
pymc3/tests/test_mixture.py	99.65% <0.00%> (+0.69%)	⬆️
pymc3/step_methods/hmc/base_hmc.py	95.32% <0.00%> (+0.93%)	⬆️
pymc3/tests/test_transforms.py	100.00% <0.00%> (+1.47%)	⬆️
pymc3/tests/test_distributions.py	98.14% <0.00%> (+1.72%)	⬆️
pymc3/tests/test_step.py	100.00% <0.00%> (+6.79%)	⬆️
pymc3/tests/models.py	85.95% <0.00%> (+15.70%)	⬆️

[twiecki]

@sleepy-owl Definitely, thanks!