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MicroJAX

Plot of tanh(x) and its First Four Derivatives

python tanh.py

Microjax is function transformation engine like JAX or MLX,
it’s got forward mode and reverse mode automatic differentiation support!, and support for nested structures (PyTrees). 🌳

Blog: https://huggingface.co/blog/joey00072/microjax

🗂️ What's Inside?

  • microjax.py: The magic of auto-diff happens here.
  • pytree.py: 🌳 Flatten and unflatten those nested data structures
  • nn.py: Build a simple neural net and watch it learn XOR! 🧠
  • tanh.py: Visualize the tanh function and its first four derivatives. 📈
  • picojax.py: A extra small version of microjax.py (only +,* ops)

🚀 Quick Start

from microjax import grad

def f(x):
    return x*x+2*x+3
print(f"f(3.0) = {f(3.0)}")
print(f"f'(3.0) = {grad(f)(3.0)}")
❯ python dev.py
f(3.0) = 18.0
f'(3.0) = 8.0

Neural Net

❯ python nn.py 

0 => 0.50
1 => 0.34
1 => 0.44
0 => 0.32
--
loss: 0.2760428769255213
loss: 0.004209124188658117
loss: 0.000980696758933267
loss: 0.0005531283006194049
loss: 0.0003506475890801604
loss: 0.00023928890318040665
loss: 0.00017250868939842852
loss: 0.00012976140589010524
loss: 0.00010094563548150575
loss: 8.068691802714326e-05
--
0 => 0.00
1 => 0.99
1 => 0.99
0 => 0.01

Look into microjax.py

❯ python microjax.py
## Forward Mode Automatic Differentiation (JVP) ##
f(x) = 118.87663200000001
f'(x) = 103.2964
f''(x) = 60.519999999999996
f'''(x) = 18.0
------------------------------------------------------------------------------

## Reverse Mode Automatic Differentiation (VJP) ##
f(x) = 118.87663200000001
f'(x) = 103.2964
f''(x) = 60.519999999999996
f'''(x) = 18
------------------------------------------------------------------------------ 

## Composition of Forward and Backward ##
Forward on Backward 60.519999999999996
Backward on Forward 60.519999999999996

------------------------------------------------------------------------------

## pytree.py ##
{'hi': 0.01493120808257803, 'there': [1.0, 0.0]}

------------------------------------------------------------------------------
MicroJAX:  0.01493120808257803
JAX:  0.014931838

Limitations

  • Only supports scalars
  • slicing broadcating is NOT supported, but you can use numpy instead scalers
    • Adding ndarray support add complexity to the codebase, Keeping it Micro

📜 License

MIT License.

ko-fi