blei-lab / edward / 3534

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Feature/simpler conjugacy (#588)

* Rewritten approach that's more in line with contrib.distributions.

* Beginnings of new conjugacy implementation

* Most basic beta-bernoulli example working

* Added beta-bernoulli conjugacy example. Minor bugfix.

* Deleted some crufty commented code

* Got rid of _conj_log_prob_registry.

* Replaced string keys with tuples

* Gamma and Poisson

* Support for simplish rewrites and smarter identity.

* Added normal

* Rewrite of conjugacy engine

* More conjugacy updates. Still not working in general.

* Refactoring

* Added tests of simplify

* Finally got new approach working for normal, inverse-gamma.

* Simplified Identity node handling

* Added gamma support back in.

* Eliminated some extraneous parentheses

* Got beta support back in

* Added option to feed in custom log-joint

* Added Dirichlet and Categorical

* Added a notion of support to random variables

* Trying to get some Bernoulli stuff to work

* Refactored complete_conditional().

* Fixed a bug in graph copying

* Deleted print

* Changed #Pow to #CPow in preparation to properly support tf.pow().

* Improved pow rewrite support

* Some more edge cases

* Fixed some scoping problems

* Added (not yet stringent) Bernoulli MoG test

* Added simplify for (x + y)**2

* Moved simplify tests to their own file

* First stab at ParamMixture. Doesn't quite work yet.

* ParamMixture mostly working.

* Mixture of Gaussians works

* Added mixture-of-Gaussians Gibbs example

* PEP8 fixes

* Bugfix for when rv is not included in blanket.

* Updated tests for new sample_shape feature

* Removed extraneous call to tf.identity() that was breaking a test.

* More PEP8

* One more PEP8 commit

* Python 3 compatibility fixes

* python3 compatibility

* One last PEP8 fix

* Bringing ParamMixture up-to-date

* update tests

* Fixed a bug where rv isn't part of blanket

* G... (continued)

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