9.1 KiB
Jittor: a Just-in-time(JIT) deep learning framework
Quickstart | Install | Tutorial | Chinese
Jittor is a high-performance deep learning framework based on JIT compiling and meta-operators. The whole framework and meta-operators are compiled just-in-time. A powerful op compiler and tuner are integrated into Jittor. It allowed us to generate high-performance code with specialized for your model.
The front-end language is Python. Module Design is used in the front-end, which is the most popular design for deeplearning framework interface. The back-end is implemented by high performance language, such as CUDA,C++.
The following example shows how to model a two-layer neural network step by step and train from scratch In a few lines of Python code.
import jittor as jt
from jittor import Module
from jittor import nn
import numpy as np
class Model(Module):
def __init__(self):
self.layer1 = nn.Linear(1, 10)
self.relu = nn.Relu()
self.layer2 = nn.Linear(10, 1)
def execute (self,x) :
x = self.layer1(x)
x = self.relu(x)
x = self.layer2(x)
return x
def get_data(n): # generate random data for training test.
for i in range(n):
x = np.random.rand(batch_size, 1)
y = x*x
yield jt.float32(x), jt.float32(y)
learning_rate = 0.1
batch_size = 50
n = 1000
model = Model()
optim = nn.SGD(model.parameters(), learning_rate)
for i,(x,y) in enumerate(get_data(n)):
pred_y = model(x)
dy = pred_y - y
loss = dy * dy
loss_mean = loss.mean()
optim.step(loss_mean)
print(f"step {i}, loss = {loss_mean.data.sum()}")
Contents
Quickstart
We provide some jupyter notebooks to help you quick start with Jittor.
- Example: Model definition and training
- Basics: Op, Var
- Meta-operator: Implement your own convolution with Meta-operator
Install
We provide a Docker installation method to save you from configuring the environment. The Docker installation method is as follows:
# CPU only
docker run -it --network host jittor/jittor
# CPU and CUDA
docker run -it --network host jittor/jittor-cuda
Jittor is written in Python and C++. It requires a compiler for JIT compilation, Currently, we support four compilers:
- CPU compiler (require at least one of the following)
- g++ (>=5.4.0)
- clang (>=8.0)
- GPU compiler (optional)
- nvcc (>=10.0 for g++ or >=10.2 for clang)
Jittor environment requirements:
- System: Ubuntu >= 16.04 (or Windows Subsystem of Linux)
- Python version >= 3.7
- C++ compiler(g++ or clang)
Note: Currently Jittor runs on the Windows operating system through WSL. For the installation method of WSL, please refer to Microsoft official website. WSL does not yet support CUDA.
Jittor offers three ways to install: pip, script or manual.
Pip install
sudo apt install python3.7-dev libomp-dev
sudo python3.7 -m pip install git+https://github.com/Jittor/jittor.git
python3.7 -m jittor.test.test_example
single line script install
We provide single line command for quick installation the latest version of Jittor(Ubuntu>=16.04):
# install with clang and cuda
wget -O - https://raw.githubusercontent.com/Jittor/jittor/master/script/install.sh | with_clang=1 with_cuda=1 bash
# install with clang
wget -O - https://raw.githubusercontent.com/Jittor/jittor/master/script/install.sh | with_clang=1 bash
# install with g++ and cuda
wget -O - https://raw.githubusercontent.com/Jittor/jittor/master/script/install.sh | with_gcc=1 with_cuda=1 bash
# install with g++
wget -O - https://raw.githubusercontent.com/Jittor/jittor/master/script/install.sh | with_gcc=1 bash
After execution, the script will show some environment variables you need to export.
If you use Jittor for CPU computing, we strongly recommend clang(>=8.0) as the back-end compiler of Jittor. Because some customized optimizations will be enabled.
manual install
We will show how to install Jittor in Ubuntu 16.04 step by step, Other Linux distributions may have similar commands.
Step 1: Choose your back-end compiler
# g++
sudo apt install g++ build-essential libomp-dev
# OR clang++-8
wget -O - https://raw.githubusercontent.com/Jittor/jittor/master/script/install_llvm.sh > /tmp/llvm.sh
bash /tmp/llvm.sh 8
Step 2: Install Python and python-dev
Jittor need python version >= 3.7.
sudo apt install python3.7 python3.7-dev
Step 3: Run Jittor
The whole framework is compiled Just-in-time. Let's install jittor via pip
git clone https://github.com/Jittor/jittor.git
sudo pip3.7 install ./jittor
export cc_path="clang++-8"
# if other compiler is used, change cc_path
# export cc_path="g++"
# export cc_path="icc"
# run a simple test
python3.7 -m jittor.test.test_example
if the test is passed, your Jittor is ready.
Optional Step 4: Enable CUDA
Using CUDA in Jittor is very simple, Just setup environment value nvcc_path
# replace this var with your nvcc location
export nvcc_path="/usr/local/cuda/bin/nvcc"
# run a simple cuda test
python3.7 -m jittor.test.test_cuda
if the test is passed, your can use Jittor with CUDA by setting use_cuda flag.
import jittor as jt
jt.flags.use_cuda = 1
Optional Step 5: Run full tests
To check the integrity of Jittor, you can run full tests.
python3.7 -m jittor.test -v
if those tests are failed, please report bugs for us, and feel free to contribute ^_^
Tutorial
In the tutorial section, we will briefly explain the basic concept of Jittor.
To train your model with Jittor, there are only three main concepts you need to know:
- Var: basic data type of jittor
- Operations: Jittor'op is simular with numpy
Var
First, let's get started with Var. Var is the basic data type of jittor. Computation process in Jittor is asynchronous for optimization. If you want to access the data, Var.data can be used for synchronous data accessing.
import jittor as jt
a = jt.float32([1,2,3])
print (a)
print (a.data)
# Output: float32[3,]
# Output: [ 1. 2. 3.]
And we can give the variable a name.
c.name('c')
print(c.name())
# Output: c
Operations
Jittor'op is simular with numpy. Let's try some operations. We create Var a and b via operation jt.float32, and add them. Printing those variables shows they have the same shape and dtype.
import jittor as jt
a = jt.float32([1,2,3])
b = jt.float32([4,5,6])
c = a*b
print(a,b,c)
print(type(a), type(b), type(c))
# Output: float32[3,] float32[3,] float32[3,]
# Output: <class 'jittor_core.Var'> <class 'jittor_core.Var'> <class 'jittor_core.Var'>
Beside that, All the operators we used jt.xxx(Var, ...) have alias Var.xxx(...). For example:
c.max() # alias of jt.max(c)
c.add(a) # alias of jt.add(c, a)
c.min(keepdims=True) # alias of jt.min(c, keepdims=True)
if you want to know all the operation which Jittor supports. try help(jt.ops). All the operation you found in jt.ops.xxx, can be used via alias jt.xxx.
help(jt.ops)
# Output:
# abs(x: core.Var) -> core.Var
# add(x: core.Var, y: core.Var) -> core.Var
# array(data: array) -> core.Var
# binary(x: core.Var, y: core.Var, op: str) -> core.Var
# ......
More
If you want to know more about Jittor, please check out the notebooks below:
- Quickstart
- Advanced
- Custom Op: write your operator with C++ and CUDA and JIT compile it
- Profiler: Profiling your model
- Jtune: Tool for performance tuning
Those notebooks can be started in your own computer by python3.7 -m jittor.notebook
Contributing
Jittor is still young. It may contain bugs and issues. Please report them in our bug track system. Contributions are welcome. Besides, if you have any ideas about Jittor, please let us know.
You can help Jittor in the following ways:
- Citing Jittor in your paper
- recommend Jittor to your friends
- Contributing code
- Contributed tutorials and documentation
- File an issue
- Answer jittor related questions
- Light up the stars
- Keep an eye on jittor
- ......
Contact Us
Website: http://cg.cs.tsinghua.edu.cn/jittor/
Email: jittor@qq.com
File an issue: https://github.com/Jittor/jittor/issues
The Team
Jittor is currently maintained by Dun Liang, Guo-Ye Yang, Guo-Wei Yang and Wen-Yang Zhou etc. from the Tsinghua CSCG Group. If you are also interested in Jittor and want to improve it, Please join us!
License
Jittor is Apache 2.0 licensed, as found in the LICENSE.txt file.