PyTea: PyTorch Tensor shape error analyzer

Overview

PyTea: PyTorch Tensor Shape Error Analyzer

paper project page

Requirements

  • node.js >= 12.x
  • python >= 3.8
    • z3-solver >= 4.8

How to install and use

# install node.js
sudo apt-get install nodejs

# install python z3-solver
pip install z3-solver

# download pytea
wget https://github.com/ropas/pytea/releases/download/v0.1.0/pytea.zip
unzip pytea.zip

# run pytea
python bin/pytea.py path/to/source.py

# run example file
python bin/pytea.py packages/pytea/pytest/basics/scratch.py

How to build

# install dependencies
npm run install:all
pip install z3-solver

# build
npm run build

Documentations

Brief explanation of the analysis result

PyTea is composed of two analyzers.

  • Online analysis: node.js (TypeScript / JavaScript)
    • Find numeric range-based shape mismatch and misuse of API argument. If PyTea has found any error while analyzing the code, it will stop at that position and inform the errors and violated constraints to the user.
  • Offline analysis: Z3 / Python
    • The generated constraints are passed to Z3Py. Z3 will solve the constraint sets of each path and print the first violated constraint (if it exists).

The result of the Online analyzer is divided into three classes:

  • potential success path: the analyzer does not found shape mismatch until now, but the final constraint set can be violated if Z3 analyzes it on closer inspection.
  • potential unreachable path: the analyzer found a shape mismatch or API misuses, but there remain path constraints. In short, path constraint is an unresolved branch condition; that means the stopped path might be unreachable if remaining path constraints have a contradiction. Those cases will be distinguished from Offline analysis.
  • immediate failed path: the analyzer has found an error, stops its analysis immediately.

CAVEAT: If the code contains PyTorch or other third-party APIs that we have not implemented, it will raise false alarms. Nevertheless, we also record each unimplemented API call. See LOGS section from the result and search which unimplemented API call is performed.

The final result of the Offline analysis is divided into several cases.

  • Valid path: SMT solver has not found any error. Every constraint will always be fulfilled.
  • Invalid path: SMT solver found a condition that can violate some constraints. Notice that this does not mean the code will always crash, but it found an extreme case that crashes some executions.
  • Undecidable path: SMT solver has met unsolvable constraints, then timeouts. Some non-linear formulae can be classified into this case.
  • Unreachable path: Hard and Path constraints contain contradicting constraints; this path will not be realized from the beginning.

Result examples

  • Error found by Online analysis

test1

  • Error found by Offline analysis

test2

License

MIT License

This project is based on Pyright, also MIT License

Comments
  • LSTM/GRU input_size tensor shape errors

    LSTM/GRU input_size tensor shape errors

    Hi, I have met a problem while detecting LSTM tensor shape errors. The testing file below is runnable and pytea returns correctly.

    import torch
    import torch.nn as nn
    import torch.nn.functional as F
    
    
    class Model(nn.Module):
    
        def __init__(self):
            super().__init__()
            self.cnn = nn.Conv2d(3, 1, 3, 1, 1)
            self.rnn = nn.LSTM(32, 64, 1, batch_first=True)
            self.pool = nn.MaxPool2d(2, 2)
            self.fc = nn.Linear(64, 16)
    
        def forward(self, x):
            x = self.pool(F.relu(self.cnn(x)))
            x = x.view(-1, 32, 32)
            x, _ = self.rnn(x)
            x = x[:, -1, :].squeeze(1)
            x = F.relu(self.fc(x))
            x = F.softmax(x, dim=-1)
            return x
    
    
    if __name__ == "__main__":
        net = Model()
        x = torch.randn(2, 3, 64, 64)
        y = net(x)
        target = torch.argmax(torch.randn(2, 16), dim=-1)
        loss = F.cross_entropy(y, target.long())
        loss.backward()
        print(y.size())
    

    However, If I change self.rnn = nn.LSTM(32, 64, 1, batch_first=True) into self.rnn = nn.LSTM(64, 64, 1, batch_first=True), torch will report a RuntimeError: Expected 64, got 32. pytea didn't return any CONSTRAINTS information, as it supposed to.

    Then I tried to more LSTM input_size shape errors, all failed. Same situation with GRU. I think it is a bug, because I can detect Conv2d, Linear error successfully.

    opened by MCplayerFromPRC 4
  • Inconsistent with document description

    Inconsistent with document description

    Hello, I have encountered the following problems:

    First question: The content of my source file is:

       import torch
       import torch.nn as nn
    
      class Net(nn.Module):
          def __init__(self):
              super(Net, self).__init__()
              self.layers = nn.Sequential(
                  nn.Linear(28 * 28, 120),
                  nn.ReLU(),
                  nn.Linear(80, 10))
      
          def a(self):
              pass
    
        if __name__ == "__main__":
            n = Net()
    

    But when I execute the command, I get the following results:

    image

    There should be a problem with defining shape in this model.

    Second question: I used it https://github.com/pytorch/examples/blob/master/mnist/main.py , but the command is stuck and no result is returned. As follows:

    image
    opened by dejavu6 2
  • Ternary expression (A if B else C) bug report

    Ternary expression (A if B else C) bug report

    아래와 같은 코드 실행에서 문제가 발생한다는 것을 깨달았습니다.

    x = 0 if 0 <= 1 else 1
    
    # runtime output
    REDUCED HEAP: (size: 250)
      x => 1
    

    파이썬의 삼항연산자가 x = (((0 <= 1) and 0) or 1)로 파싱됩니다. Logical statement가 True, true-value가 0일 때 발생하는 오류인 것으로 보입니다.

    당장 벤치마크 코드에서 나타나는 문제는 아닙니다. Pylib builtin 구현에서 발생한 문제이므로, 다른 방식으로 구현함으로써 일단은 피해갈 수 있을 것 같습니다.

    감사합니다.

    opened by lego0901 1
  • Develop sehoon

    Develop sehoon

    UT-1~6 코드 분석에 필요한 torch API 구현 완료.

    UT-2: epoch을 1로 수정하지 않으면 timeout이됨. UT-3: Python 빌트인 함수 iter, next의 구현은 우선 넘어갔음. UT-6: buggy 코드에서 target이 free variable인데, 이를 처리해 주지 않고 분석을 실행하면 아무것도 출력하지 않는 버그가 있음.

    위 특이사항을 적절히 처리해주고 분석을 실행하면 1~6 모두 buggy 코드는 invalid, fix 코드는 valid 결과를 냄.

    opened by Sehun0819 0
  • path constraint check

    path constraint check

    분석중 한 패스에서 (텐서 모양 오류 등의) 에러를 만나면 해당 패스는 처리됨. 문제는 분기 조건문에 의해 실제로는 진행되지 않는 패스여도 로 처리가 되는 것.

    따라서 분석중 에러를 만났을 때 그 패스가 path constraint를 갖고 있으면 로 처리하여 z3단에 넘기게 수정하였음.

    TODO: z3단에 넘기기 전에 path constraint를 계산하여 Valid면 , Unsat이면 로 처리하기(else )

    opened by Sehun0819 0
  • Bump node-notifier from 8.0.0 to 8.0.1 in /packages/pyright-internal

    Bump node-notifier from 8.0.0 to 8.0.1 in /packages/pyright-internal

    Bumps node-notifier from 8.0.0 to 8.0.1.

    Changelog

    Sourced from node-notifier's changelog.

    v8.0.1

    • fixes possible injection issue for notify-send
    Commits

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