Fix ODE NB.

[twiecki]

No description provided.

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[codecov]

Codecov Report

Merging #3887 into master will decrease coverage by 1.55%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3887      +/-   ##
==========================================
- Coverage   90.74%   89.18%   -1.56%     
==========================================
  Files         135      152      +17     
  Lines       21130    23483    +2353     
==========================================
+ Hits        19174    20944    +1770     
- Misses       1956     2539     +583     

Impacted Files	Coverage Δ
pymc3/step_methods/hmc/base_hmc.py	95.32% <0.00%> (-0.94%)	⬇️
pymc3/distributions/discrete.py	74.04% <0.00%> (-0.48%)	⬇️
pymc3/gp/cov.py	98.03% <0.00%> (-0.08%)	⬇️
pymc3/backends/tracetab.py	100.00% <0.00%> (ø)
pymc3/distributions/__init__.py	100.00% <0.00%> (ø)
pymc3/examples/samplers_mvnormal.py	0.00% <0.00%> (ø)
pymc3/examples/arbitrary_stochastic.py	0.00% <0.00%> (ø)
pymc3/examples/garch_example.py	0.00% <0.00%> (ø)
pymc3/examples/rankdata_ordered.py	0.00% <0.00%> (ø)
pymc3/examples/disaster_model.py	0.00% <0.00%> (ø)
... and 26 more

[twiecki]

The ODE NB was using old API, I fixed this alongside some other smaller issues.

[fonnesbeck]

All looks good.