JAX is NumPy on the CPU, GPU, and TPU, with great automatic differentiation for high-performance machine learning research.
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- JAX Quickstart¶ JAX is NumPy on the CPU, GPU, and TPU, with great automatic differentiation for high-performance machine learning research. With its updated version of Autograd, JAX can automatically differentiate native Python and NumPy code. It can differentiate through a large subset of Python’s features, including loops, ifs, recursion.
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With its updated version of Autograd, JAX can automatically differentiate native Python and NumPy code. It can differentiate through a large subset of Python’s features, including loops, ifs, recursion, and closures, and it can even take derivatives of derivatives of derivatives. It supports reverse-mode as well as forward-mode differentiation, and the two can be composed arbitrarily to any order.
What’s new is that JAX uses XLA to compile and run your NumPy code on accelerators, like GPUs and TPUs. Compilation happens under the hood by default, with library calls getting just-in-time compiled and executed. But JAX even lets you just-in-time compile your own Python functions into XLA-optimized kernels using a one-function API. Compilation and automatic differentiation can be composed arbitrarily, so you can express sophisticated algorithms and getmaximal performance without having to leave Python.
![Jax Jax](https://i.ebayimg.com/images/g/48AAAOSwqp5d~ofB/s-l300.jpg)
Multiplying Matrices¶
We’ll be generating random data in the following examples. One big difference between NumPy and JAX is how you generate random numbers. For more details, see Common Gotchas in JAX.
Let’s dive right in and multiply two big matrices.
We added that
block_until_ready
because JAX uses asynchronous execution by default.JAX NumPy functions work on regular NumPy arrays.
That’s slower because it has to transfer data to the GPU every time. You can ensure that an NDArray is backed by device memory using
device_put
.The output of
device_put
still acts like an NDArray, but it only copies values back to the CPU when they’re needed for printing, plotting, saving to disk, branching, etc. The behavior of device_put
is equivalent to the function jit(lambdax:x)
, but it’s faster.If you have a GPU (or TPU!) these calls run on the accelerator and have the potential to be much faster than on CPU.
JAX is much more than just a GPU-backed NumPy. It also comes with a few program transformations that are useful when writing numerical code. For now, there’s three main ones:
jit
, for speeding up your code- https://qaaayhm.weebly.com/download-bejeweled-3-full-version-for-free-mac.html.
grad
, for taking derivatives vmap
, for automatic vectorization or batching.
Let’s go over these, one-by-one. We’ll also end up composing these in interesting ways.
Using jit
to speed up functions¶
JAX runs transparently on the GPU (or CPU, if you don’t have one, and TPU coming soon!). However, in the above example, JAX is dispatching kernels to the GPU one operation at a time. If we have a sequence of operations, we can use the
@jit
decorator to compile multiple operations together using XLA. Let’s try that.Jax For Mac Os
We can speed it up with
@jit
, which will jit-compile the first time selu
is called and will be cached thereafter.Taking derivatives with grad
¶
In addition to evaluating numerical functions, we also want to transform them. One transformation is automatic differentiation. In JAX, just like in Autograd, you can compute gradients with the
grad
function.![For For](/uploads/1/1/8/6/118662761/331427886.jpg)
Let’s verify with finite differences that our result is correct.
Taking derivatives is as easy as calling
grad
. grad
and jit
compose and can be mixed arbitrarily. In the above example we jitted sum_logistic
and then took its derivative. We can go further:For more advanced autodiff, you can use
jax.vjp
for reverse-mode vector-Jacobian products and jax.jvp
for forward-mode Jacobian-vector products. The two can be composed arbitrarily with one another, and with other JAX transformations. Here’s one way to compose them to make a function that efficiently computes full Hessian matrices:Auto-vectorization with vmap
¶
JAX has one more transformation in its API that you might find useful:
vmap
, the vectorizing map. It has the familiar semantics of mapping a function along array axes, but instead of keeping the loop on the outside, it pushes the loop down into a function’s primitive operations for better performance. When composed with jit
, it can be just as fast as adding the batch dimensions by hand.We’re going to work with a simple example, and promote matrix-vector products into matrix-matrix products using
vmap
. Although this is easy to do by hand in this specific case, the same technique can apply to more complicated functions.Jax For Mac Pro
Given a function such as
apply_matrix
, we can loop over a batch dimension in Python, but usually the performance of doing so is poor.We know how to batch this operation manually. In this case,
jnp.dot
handles extra batch dimensions transparently.However, suppose we had a more complicated function without batching support. We can use
vmap
to add batching support automatically.Of course,
vmap
can be arbitrarily composed with jit
, grad
, and any other JAX transformation.Jax For Mac Computers
This is just a taste of what JAX can do. We’re really excited to see what you do with it!
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