IndexError: index out of range in self

[victory-h]

In example, when I extend the length of the article and summary , I get this error.

/opt/anaconda3/envs/LDA0115/lib/python3.6/site-packages/torch/nn/modules/sparse.py in forward(self, input)
124 return F.embedding(
125 input, self.weight, self.padding_idx, self.max_norm,
--> 126 self.norm_type, self.scale_grad_by_freq, self.sparse)
127
128 def extra_repr(self) -> str:

/opt/anaconda3/envs/LDA0115/lib/python3.6/site-packages/torch/nn/functional.py in embedding(input, weight, padding_idx, max_norm, norm_type, scale_grad_by_freq, sparse)
1850 # remove once script supports set_grad_enabled
1851 no_grad_embedding_renorm(weight, input, max_norm, norm_type)
-> 1852 return torch.embedding(weight, input, padding_idx, scale_grad_by_freq, sparse)
1853
1854

IndexError: index out of range in self