Initialization from demo#4

Merged

javdrher merged 14 commits intomasterfrom

May 6, 2017

Commits on May 2, 2017

Changed the test setup so it works with nose aswell as python -m unittest
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Commits on May 5, 2017

Adjusted model initial hyperparameters in the tests. Also added functionality to restart from the initially supplied hyperparameters.
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Fixed lengthscales for python 2.7
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Prior should solve the optimization instabilities
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Implemented a restart strategy for optimization of the hypers
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Fixed initialization error of Gamma prior for python 2.7
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Merge pull request #5 from GPflow/optimization_tmp_fix
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Added coverage badge to README
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Merge branch 'demo_init' of https://github.com/GPflow/GPflowOpt into demo_init
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