examples/pybullet/gym/pybullet_envs/deep_mimic/learning/solvers/solver.py


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from abc import abstractmethod
import sys, abc
if sys.version_info >= (3, 4):
    ABC = abc.ABC
else:
    ABC = abc.ABCMeta('ABC', (), {})

class Solver(ABC):
    def __init__(self, vars):
        self.vars = vars
        return

    @abstractmethod
    def update(self, grads):
        pass