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Spaak committed Nov 27, 2020
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## PyMC3 3.10.0 (on deck)

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This is a major release with many exciting new features. The biggest change is that we now rely on our own fork of [Theano-PyMC](https://github.com/pymc-devs/Theano-PyMC). This is in line with our [big announcement about our commitment to PyMC3 and Theano](https://pymc-devs.medium.com/the-future-of-pymc3-or-theano-is-dead-long-live-theano-d8005f8a0e9b).
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### Maintenance
- Removed non-NDArray (Text, SQLite, HDF5) backends and associated tests.
- Switch the dependency of Theano to our own fork, [Theano-PyMC](https://github.com/pymc-devs/Theano-PyMC).
- Mentioned the way to do any random walk with `theano.tensor.cumsum()` in `GaussianRandomWalk` docstrings (see [#4048](https://github.com/pymc-devs/pymc3/pull/4048)).
- Fixed numerical instability in ExGaussian's logp by preventing `logpow` from returning `-inf` (see [#4050](https://github.com/pymc-devs/pymc3/pull/4050)).
- Use dill to serialize user defined logp functions in `DensityDist`. The previous serialization code fails if it is used in notebooks on Windows and Mac. `dill` is now a required dependency. (see [#3844](https://github.com/pymc-devs/pymc3/issues/3844)).
- Numerically improved stickbreaking transformation - e.g. for the `Dirichlet` distribution. [#4129](https://github.com/pymc-devs/pymc3/pull/4129)
- Enabled the `Multinomial` distribution to handle batch sizes that have more than 2 dimensions. [#4169](https://github.com/pymc-devs/pymc3/pull/4169)
- Fixed bug in `draw_values`, in which values that had been drawn in a separate `_DrawValuesContext` were not added to the `givens` dictionary and lead to `ValueError: Cannot resolve inputs for ...` exceptions. Fixes issue [#3789](https://github.com/pymc-devs/pymc3/issues/3789)

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When upgrading, make sure that `Theano-PyMC` and not `Theano` are installed (the imports remain unchanged, however). If not, you can uninstall `Theano`:
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