This is the artifact of the research paper, "Free Lunch for Testing: Fuzzing Deep-Learning Libraries from Open Source", at ICSE 2022.

FreeFuzz is the first approach to fuzzing DL libraries via mining from open source. It collects code/models from three different sources: 1) code snippets from the library documentation, 2) library developer tests, and 3) DL models in the wild. Then, FreeFuzz automatically runs all the collected code/models with instrumentation to collect the dynamic information for each covered API. Lastly, FreeFuzz will leverage the traced dynamic information to perform fuzz testing for each covered API.

This is the FreeFuzz's implementation for testing PyTorch and TensorFlow.

1. Our testing framework leverages MongoDB so you should install and run MongoDB first.
   • Run the command ulimit -n 64000 to adjust the limit that the system resources a process may use. You can see this document for more details.
2. You should check our dependent python libraries in requirements.txt and run pip install -r requirements.txt to install them
3. Python version >= 3.8.0 (It must support f-string.)

Run the following command to load the database.

mongorestore dump/

1. Go to src/instrumentation/{torch, tensorflow} to see how to intrument the dynamic information and add them into the database
2. After adding invocation data, you should run the following command to preprocess the data for PyTorch

cd src && python preprocess/process_data.py torch

or for TensorFlow

cd src && python preprocess/process_data.py tf

There are some hyper-parameters in FreeFuzz and they could be easily configured as follows.

In src/config/demo.conf:

1. MongoDB database configuration.

[mongodb]
# your-mongodb-server
host = 127.0.0.1
# mongodb port
port = 27017 
# name of pytorch database
torch_database = freefuzz-torch
# name of tensorflow database
tf_database = freefuzz-tf

2. Output directory configuration.

[output]
# output directory for pytorch
torch_output = torch-output
# output directory for tensorflow
tf_output = tf-output

3. Oracle configuration.

[oracle]
# enable crash oracle
enable_crash = true
# enable cuda oracle
enable_cuda = true
# enable precision oracle
enable_precision = true
# float difference bound: if |a-b| > bound, a is different than b
float_difference_bound = 1e-5
# max time bound: if time(low_precision) > bound * time(high_precision),
# it will be considered as a potential bug
max_time_bound = 10
# only consider the call with time(call) > time_thresold
time_thresold = 1e-3

4. Mutation stratgy configuration.

[mutation]
enable_value_mutation = true
enable_type_mutation = true
enable_db_mutation = true
# the number of times each api is executed
each_api_run_times = 1000

After finishing above steps, run the following command to start FreeFuzz to test PyTorch

cd src && python FreeFuzz.py --conf demo_torch.conf

Or run this command to test TensorFlow

cd src && python FreeFuzz.py --conf demo_tf.conf

To run the full experiment, run the following command

cd src && python FreeFuzz.py --conf expr.conf

If you want to use another configuration file, you can put it in src/config.

Note that you should specify the configuration file you want to use.

1. Some APIs will be skipped since they may crash the program. You can set what you want to skip in the file src/config/skip_torch.txt or src/config/skip_tf.
2. For the details of three mutation strategies, please refer to our paper.