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Solve the following problem using Python, implementing the functions described below, one line at a time
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<USER_TASK:>
Description:
 def verify_link_in_task_graph(chain, decision_link, task_link):
 """Compare the runtime task definition against the decision task graph. Args: chain (ChainOfTrust):
 the chain we're operating on. decision_link (LinkOfTrust):
 the decision task link task_link (LinkOfTrust):
 the task link we're testing Raises: CoTError: on failure. """

    log.info("Verifying the {} {} task definition is part of the {} {} task graph...".format(
        task_link.name, task_link.task_id, decision_link.name, decision_link.task_id
    ))
    if task_link.task_id in decision_link.task_graph:
        graph_defn = deepcopy(decision_link.task_graph[task_link.task_id])
        verify_task_in_task_graph(task_link, graph_defn)
        log.info("Found {} in the graph; it's a match".format(task_link.task_id))
        return
    raise_on_errors(["Can't find task {} {} in {} {} task-graph.json!".format(
        task_link.name, task_link.task_id, decision_link.name, decision_link.task_id
    )])