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fuzz.py
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fuzz.py
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import time
import os
import uuid
import datetime
import random
import shutil
import datetime
from typing import Dict, Iterable, Union, List
# Edge coverage. See https://github.com/ganler/tvm/tree/coverage
import git
import rich
from rich.progress import Progress, BarColumn, ProgressColumn
from rich.panel import Panel
from rich.console import RenderableType
from rich.columns import Columns
from nnsmith.error import NNSmithInternalError, SanityCheck
from nnsmith.graph_gen import GenerationTable
from nnsmith.backends import DiffTestBackend
from nnsmith.input_gen import gen_one_input_rngs
from nnsmith.difftest import assert_allclose
from nnsmith.graph_input_gen import forked_execution
__COV_DRIVER__ = None
_METADATA_NAME_ = 'meta.txt'
_COV_BY_TIME_NAME_ = 'cov_by_time.csv'
# NOTE: Currently only engineered for TVM.
class Reporter: # From Tzer.
def __init__(self, report_folder=None, name_hint='') -> None:
# Checks
self.start_time = time.perf_counter()
self.report_folder = report_folder
if report_folder is None:
self.report_folder = f'fuzzing-report-{uuid.uuid4()}'
if os.path.exists(self.report_folder):
# TODO: Allow continous fuzzing...
decision = ''
while decision.lower() not in ['y', 'n']:
decision = input(
'Report folder already exists. Press [Y/N] to continue or exit...')
if decision.lower() == 'n':
raise NNSmithInternalError(
f'{self.report_folder} already exist... We want an empty folder to report...')
else:
shutil.rmtree(self.report_folder)
os.mkdir(self.report_folder)
print(f'Create report folder: {self.report_folder}')
print(f'Using `{self.report_folder}` as the fuzzing report folder')
with open(os.path.join(self.report_folder, _METADATA_NAME_), 'w') as f:
fuzz_repo = git.Repo(search_parent_directories=True)
def _log_repo(f, tag, repo: git.Repo):
if not repo:
return
f.write(f'{tag} GIT HASH: {repo.head.object.hexsha}\n')
f.write(f'{tag} GIT STATUS: ')
f.write(
'\n@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\n')
f.write(repo.git.status())
f.write(
'\n@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\n\n')
f.write(f'START TIME: {datetime.datetime.now()}')
_log_repo(f, 'Fuzzer', fuzz_repo)
if 'tvm' in name_hint:
_log_repo(f, 'TVM', os.getenv('TVM_HOME'))
self.n_bug = 0
def report_bug(self, err_type: Exception, buggy_onnx_path: str, message: str):
dir = f'{type(err_type).__name__}__{self.n_bug}'
os.mkdir(os.path.join(self.report_folder, dir))
shutil.move(buggy_onnx_path, os.path.join(
self.report_folder, dir, 'model.onnx'))
with open(os.path.join(self.report_folder, dir, 'err.txt'), 'w') as f:
f.write(message)
self.n_bug += 1
def record_coverage(self):
with open(os.path.join(self.report_folder, _COV_BY_TIME_NAME_), 'a') as f:
f.write(
f'{time.perf_counter() - self.start_time :.2f},{__COV_DRIVER__.get_now()}\n')
class CustomProgress(Progress):
def __init__(self, fuzz_status, columns: List[Union[str, ProgressColumn]]):
self.fuzz_status = fuzz_status
super().__init__(*columns)
def get_renderables(self) -> Iterable[RenderableType]:
"""Get a number of renderables for the progress display."""
yield self.fuzz_status()
table = self.make_tasks_table(self.tasks)
yield table
class FuzzingLoop: # TODO: Support multiple backends.
def __init__(self, backends: Dict[str, DiffTestBackend], mode='table', root=None, time_budget=60 * 60 * 4, max_nodes=32):
self.root = root
self.reporter = Reporter(
report_folder=root, name_hint=list(backends.keys())[0])
self.mode = mode # `random` or `table`
self.table = GenerationTable() if mode == 'table' else None
SanityCheck.gt(len(backends), 0, "Empty backends are not allowed!")
self.backends = backends
self.time_budget = time_budget
self.max_nodes = max_nodes
self.cur_model_gen_t = float('nan')
self.slowest_model_gen_t = -float("inf")
self.fastest_model_gen_t = float("inf")
self.cur_model_eval_t = float('nan')
self.slowest_model_eval_t = -float("inf")
self.fastest_model_eval_t = float("inf")
rich.print(
f'[bold yellow]To exit the program: `kill {os.getpid()}`[/bold yellow]')
rich.print(
'[grey]This is because we use z3 written in C++ w/ Python wrappers. Ctrl+C may not stop it.')
def rich(self):
return Columns([
Panel.fit(
f'{datetime.timedelta(seconds=round(time.time()-self.start_time))} ~ '
f'{datetime.timedelta(seconds=self.time_budget)}',
title="Time Left ~ Total Time"),
Panel.fit(f'{self.reporter.n_bug}',
title="#Bugs", style="magenta"),
Panel.fit(f'[green]Fast: {self.fastest_model_gen_t:.3f}s[/green]|'
f'[bold]Cur: {self.cur_model_gen_t:.3f}s[/bold]|'
f'[red]Slow: {self.slowest_model_gen_t:.3f}s',
title="Model Generation Time"),
Panel.fit(f'[green]Fast: {self.fastest_model_eval_t:.3f}s[/green]|'
f'[bold]Cur: {self.cur_model_eval_t:.3f}s[/bold]|'
f'[red]Slow: {self.slowest_model_eval_t:.3f}s',
title="Model Evaluation Time"),
])
def fuzz(self):
_TMP_ONNX_FILE_ = f'tmp_{uuid.uuid4()}.onnx'
_PER_MODEL_TIMEOUT_ = 1000 # milliseconds
self.start_time = time.time()
last_cov = 0
try:
with CustomProgress(
fuzz_status=self.rich,
columns=[
"[progress.description]{task.description}",
BarColumn(),
'[progress.percentage]{task.completed:>3.0f}/{task.total}',
'[progress.percentage]{task.percentage:>3.0f}%'],
) as progress:
task_fuzz = progress.add_task(
'[green]Fuzzing time.', total=self.time_budget)
task_coverage = progress.add_task(
'[green]Edge coverage.', total=__COV_DRIVER__.get_total())
while True:
self.reporter.record_coverage()
gen_t_s = time.time()
# gen = PureSymbolGen()
# gen.abstract_gen(max_node_size=random.randint(1, self.max_nodes),
# max_gen_millisec=_PER_MODEL_TIMEOUT_)
# solution = gen.get_symbol_solutions()
# # input_shape = gen.concretize_input_shape(solution)
# net = SymbolNet(gen.abstract_graph, solution)
# net.eval()
# # net.set_input_spec(input_shape)
# torch2onnx(model=net, filename=_TMP_ONNX_FILE_)
rngs, state, edge_set = forked_execution(self.mode,
_TMP_ONNX_FILE_,
table=self.table,
max_node_size=random.randint(
1, self.max_nodes),
max_gen_millisec=_PER_MODEL_TIMEOUT_)
# Generation time logging.
self.cur_model_gen_t = time.time() - gen_t_s
self.fastest_model_gen_t = min(
self.fastest_model_gen_t, self.cur_model_gen_t)
self.slowest_model_gen_t = max(
self.slowest_model_gen_t, self.cur_model_gen_t)
try: # TODO: multi-process support for isolation.
eval_t_s = time.time()
onnx_model = DiffTestBackend.get_onnx_proto(
_TMP_ONNX_FILE_)
input_spec, onames = DiffTestBackend.analyze_onnx_io(
onnx_model)
inp = gen_one_input_rngs(input_spec, rngs)
difftest_pool = {}
for bname in self.backends:
difftest_pool[bname] = self.backends[bname].predict(
onnx_model, inp)
keys = list(difftest_pool.keys())
for idx in range(1, len(keys)):
assert_allclose(
difftest_pool[keys[0]],
difftest_pool[keys[idx]],
keys[0], keys[idx],
nan_as_err=False)
# Evaluation time logging.
self.cur_model_eval_t = time.time() - eval_t_s
self.fastest_model_eval_t = min(
self.fastest_model_eval_t, self.cur_model_eval_t)
self.slowest_model_eval_t = max(self.slowest_model_eval_t,
self.cur_model_eval_t)
cur_cov = __COV_DRIVER__.get_now()
if edge_set:
for src, dst in edge_set:
if cur_cov == last_cov:
self.table.on_no_cov(src, dst)
else:
self.table.on_new_cov(src, dst)
# for the whole graph
# self.table.on_no_cov()
except Exception as e:
self.reporter.report_bug(e, _TMP_ONNX_FILE_, str(e))
cur_time = time.time()
progress.update(
task_fuzz, completed=cur_time - self.start_time)
progress.update(
task_coverage, completed=__COV_DRIVER__.get_now())
if cur_time - self.start_time > self.time_budget:
break
finally: # cleanup
if os.path.exists(_TMP_ONNX_FILE_):
os.remove(_TMP_ONNX_FILE_)
last_cov = __COV_DRIVER__.get_now()
if __name__ == '__main__':
import argparse
parser = argparse.ArgumentParser()
parser.add_argument('--root', type=str, default='./fuzz_report')
parser.add_argument('--time_budget', type=int, default=60 * 60 * 4)
parser.add_argument('--backend', type=str, default='tvm')
parser.add_argument('--mode', type=str, default='table')
args = parser.parse_args()
backends = None
if args.backend == 'tvm':
from nnsmith.backends.tvm_graph import TVMExecutor
backends = {'tvm-opt': TVMExecutor(opt_level=4),
'tvm-debug': TVMExecutor(opt_level=0)}
__COV_DRIVER__ = TVMExecutor.coverage_install()
elif args.backend == 'ort':
from nnsmith.backends.ort_graph import ORTExecutor
backends = {'ort-opt': ORTExecutor(opt_level=3),
'ort-debug': ORTExecutor(opt_level=0)}
__COV_DRIVER__ = ORTExecutor.coverage_install()
else:
raise NotImplementedError("Other backends not supported yet.")
fuzzing_loop = FuzzingLoop(
root=args.root,
backends=backends,
mode=args.mode,
time_budget=args.time_budget)
fuzzing_loop.fuzz()