* [GitHub commits](https://github.com/google/jax/compare/jax-v0.1.62...jax-v0.1.63).
* Added `jax.custom_jvp` and `jax.custom_vjp` from {jax-issue}`2026`, see the [tutorial notebook](https://jax.readthedocs.io/en/latest/notebooks/Custom_derivative_rules_for_Python_code.html). Deprecated `jax.custom_transforms` and removed it from the docs (though it still works).
* Add `scipy.sparse.linalg.cg` {jax-issue}`2566`.
* Changed how Tracers are printed to show more useful information for debugging {jax-issue}`2591`.
* Made `jax.numpy.isclose` handle `nan` and `inf` correctly {jax-issue}`2501`.
* Added several new rules for `jax.experimental.jet` {jax-issue}`2537`.
* Fixed `jax.experimental.stax.BatchNorm` when `scale`/`center` isn't provided.
* Fix some missing cases of broadcasting in `jax.numpy.einsum` {jax-issue}`2512`.
* Implement `jax.numpy.cumsum` and `jax.numpy.cumprod` in terms of a parallel prefix scan {jax-issue}`2596` and make `reduce_prod` differentiable to arbitray order {jax-issue}`2597`.
* Add `batch_group_count` to `conv_general_dilated` {jax-issue}`2635`.
* Add docstring for `test_util.check_grads` {jax-issue}`2656`.
* Add `callback_transform` {jax-issue}`2665`.
* Implement `rollaxis`, `convolve`/`correlate` 1d & 2d, `copysign`,
`trunc`, `roots`, and `quantile`/`percentile` interpolation options.
jaxlib 0.1.43 (March 31, 2020)
* Fixed a performance regression for Resnet-50 on GPU.