perplexity = tensor(2.2904)
perplexity = tensor(2.1728)
perplexity = tensor(2.1122)
perplexity = tensor(2.0730)
perplexity = tensor(2.0399)
perplexity = tensor(2.0351)
perplexity = tensor(2.0084)
perplexity = tensor(1.9989)
perplexity = tensor(1.9771)
perplexity = tensor(1.9837)
perplexity = tensor(1.9665)
perplexity = tensor(1.9643)
perplexity = tensor(1.9716)
perplexity = tensor(1.9557)
perplexity = tensor(1.9557)