kiri-ml 0.2.1

Lightweight ML framework for Apple Silicon and CPU — no CUDA required

🌫️ Kiri

Lightweight ML for everyone. No CUDA required.

Kiri is a Python deep learning framework that runs natively on Apple Silicon (M1/M2/M3/M4) and falls back gracefully to CPU on any machine. Built for students and developers who want to train real models without a $3000 gaming PC.

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The problem

You're in an ML course. The assignment asks you to train a CNN on MNIST. Your classmates with gaming rigs are done in 5 minutes. You have a MacBook Air or a budget laptop. You either wait 3 hours, crash out of memory, or give up.

Kiri fixes this.

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Install

# Apple Silicon (M1/M2/M3/M4) — Metal GPU acceleration
pip install kiri-ml[apple]

# Everything else (Intel Mac, Windows, Linux) — CPU
pip install kiri-ml

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Quick start

import kiri
import kiri.nn as nn
import numpy as np

On import, Kiri auto-detects your hardware:

╭─ Kiri 🌫️ ─────────────────────────────╮
│  Backend  : Apple Silicon (MLX)        │
│  Chip     : arm64                      │
│  Memory   : 16GB unified memory        │
│  Status   : ✓ Metal GPU + CPU active   │
╰────────────────────────────────────────╯
  Kiri v0.1.0  │  backend: mlx

Train a model

class MLP(kiri.Model):
    def __init__(self):
        super().__init__()
        self.net = nn.Sequential(
            nn.Linear(784, 256),
            nn.ReLU(),
            nn.Dropout(0.3),
            nn.Linear(256, 10)
        )

    def forward(self, x):
        return self.net(x)

model = MLP()
history = model.fit(X_train, y_train, epochs=10, lr=1e-3, batch_size=64)

acc = model.accuracy(X_test, y_test)
print(f"Test accuracy: {acc*100:.1f}%")

With DataLoader and scheduler

loader    = kiri.DataLoader((X_train, y_train), batch_size=64, shuffle=True)
optimizer = kiri.optim.Adam(model, lr=1e-3)          # pass model on Apple Silicon
scheduler = kiri.optim.CosineAnnealingLR(optimizer, T_max=10)

history = model.fit(
    loader,
    epochs=10,
    optimizer=optimizer,
    scheduler=scheduler,
    val_data=(X_test, y_test),
)

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What's included

Layers

Layer	Description
nn.Linear(in, out)	Fully connected
nn.Conv2d(in, out, k)	2D convolution
nn.MaxPool2d(k)	Max pooling
nn.AvgPool2d(k)	Average pooling
nn.BatchNorm1d(n)	Batch normalization
nn.Dropout(p)	Dropout
nn.Flatten()	Reshape to (N, -1)
nn.Sequential(*layers)	Layer stack
nn.Embedding(vocab, dim)	Token embeddings
nn.LSTM(in, hidden)	LSTM

Activations

nn.ReLU · nn.LeakyReLU · nn.Sigmoid · nn.Tanh · nn.Softmax · nn.GELU

Losses

nn.cross_entropy · nn.mse_loss · nn.binary_cross_entropy

Optimizers

optim.SGD · optim.Adam · optim.AdamW

Schedulers

optim.StepLR · optim.CosineAnnealingLR · optim.ReduceLROnPlateau · optim.LinearWarmup

Model API

model.fit(data, y, epochs, lr, batch_size, optimizer, scheduler, val_data, verbose)
model.predict(X)
model.predict_classes(X)
model.accuracy(X, y)
model.save("weights.npz")
model.load("weights.npz")
model.train()
model.eval()

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How it works

Kiri auto-detects hardware on import and dispatches to the right backend:

• Apple Silicon (M1/M2/M3/M4) → MLX backend. Metal GPU + unified memory. Zero-copy CPU↔GPU. Up to 192GB shared memory on M4 Ultra — run 70B models locally.
• Everything else → NumPy backend with a built-in autograd engine. No dependencies beyond NumPy.

The same model code runs on both — you write it once, Kiri handles the rest.

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Architecture

kiri/
├── __init__.py          ← auto-detects hardware, prints report
├── autograd.py          ← autograd engine (CPU backend)
├── model.py             ← Model base class
├── data.py              ← DataLoader, Dataset, TensorDataset
├── nn/
│   ├── layers.py        ← Linear, Conv2d, BatchNorm, Dropout, Sequential
│   ├── activations.py   ← ReLU, Sigmoid, Softmax, GELU, ...
│   ├── pooling.py       ← MaxPool2d, AvgPool2d
│   ├── recurrent.py     ← Embedding, LSTM
│   └── loss.py          ← cross_entropy, mse_loss, bce
├── optim/
│   ├── optimizers.py    ← SGD, Adam, AdamW
│   └── schedulers.py    ← StepLR, CosineAnnealing, ReduceLROnPlateau
└── backend/
    ├── detect.py        ← hardware detection
    └── cpu_ops.py       ← NumPy conv2d, pooling kernels

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Roadmap

• Dense layers, CNNs, RNNs
• Adam, SGD, AdamW
• LR schedulers
• DataLoader
• Apple Silicon auto-detection
• Direct Apple Neural Engine dispatch (ANE)
• Operator fusion (Linear → BN → ReLU in one kernel)
• ONNX export
• kiri.datasets (MNIST, CIFAR-10 auto-download)

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Contributing

PRs welcome. Run tests with:

pip install kiri-ml[dev]
pytest tests/ -v

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License

MIT