def has_targets(self):
        raise NotImplementedError()
Gets a collection for all precall hooks.
dataset/ETHPy150Open lisa-lab/pylearn2/pylearn2/datasets/dataset.py/Dataset.has_targets--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/api/apiproxy_stub_map.py/APIProxyStubMap.GetPreCallHooks