如何使用xgboost

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class ListNode:
    def __init__(self, x):
        self.val = x
        self.next = None

def reverseList(head: ListNode) -> ListNode:
    if not head or not head.next:
        return head
    pre = None
    cur = head
    while cur:
        tmp = cur.next
        cur.next = pre
        pre = cur
        cur = tmp
    return pre