How to use the tensortrade.base.context.TradingContext function in tensortrade

def test_init():
    c = TradingContext(base_instrument=config['base_instrument'],
                       instruments=config['instruments'])
    assert c.shared.get('base_instrument') == 'EURO'
    assert c.shared.get('instruments') == ['BTC', 'ETH']

def test_has_config_attribute():
    c = TradingContext()

    assert hasattr(c, 'shared')
    assert hasattr(c, 'exchanges')
    assert hasattr(c, 'actions')
    assert hasattr(c, 'rewards')
    assert hasattr(c, 'features')

def test_init_with_kwargs():
    c = TradingContext(**config)
    assert c.shared.get('base_instrument') == 'EURO'
    assert c.shared.get('instruments') == ['BTC', 'ETH']

def get_context():
    return TradingContext.get_context()

def get_contexts(cls):
        if not hasattr(cls.contexts, 'stack'):
            cls.contexts.stack = [TradingContext()]

        return cls.contexts.stack

def __call__(cls, *args, **kwargs):
        registered_name = get_registry()[cls]
        tc = TradingContext.get_context()
        data = tc.data.get(registered_name, {})
        config = {**tc.shared, **data}

        instance = cls.__new__(cls, *args, **kwargs)
        setattr(instance, 'context', Context(**config))
        instance.__init__(*args, **kwargs)

        return instance

def from_yaml(cls, path: str):
        with open(path, "rb") as fp:
            config = yaml.load(fp, Loader=yaml.FullLoader)

        return TradingContext(**config)

def from_json(cls, path: str):
        with open(path, "rb") as fp:
            config = json.load(fp)

        return TradingContext(**config)