"""第 13 课补全练习：把表示分成多个头。修改 solve，保持下方检查不变。"""
import math, io, argparse
import torch
from torch import nn
from torch.nn import functional as F
torch.set_num_threads(2)
torch.manual_seed(26)

def solve(x, heads):
    raise NotImplementedError("请补全：把表示分成多个头；参考答案见 solution.py")

x=torch.arange(24).view(1,3,8)
y=solve(x,2)
assert y.shape==(1,2,3,4)
assert torch.equal(y[0,1,0],x[0,0,4:])
print("本课补全练习通过。")