def get_size():
        out = Array()
        safe_call(backend.get().af_get_features_size(ct.pointer(out.arr), self.feat))
        return out
Ensures the jsonDict corresponds to a valid instance of requestClass
dataset/ETHPy150Open arrayfire/arrayfire-python/arrayfire/features.py/Features.get_size--crossover with--dataset/ETHPy150Open ga4gh/server/ga4gh/backend.py/Backend.validateRequest