def request_hook(optional=True):
    def _hook(hook):
        return APIHooks().add_request_hook(hook, optional)
    return _hook
**SUMMARY**
dataset/ETHPy150Open softlayer/jumpgate/jumpgate/common/hooks/__init__.py/request_hook--crossover with--dataset/ETHPy150Open sightmachine/SimpleCV/SimpleCV/Tracking/TrackSet.py/TrackSet.__pixelVelocity