Fix examples in perplexity measurement docs

[mathemakitten]

The examples for the perplexity measurement card here are wrong since the perplexity measurement module does not take input_texts. It should be run by passing input text via the data argument instead.

Reproduce original error with:

perplexity = evaluate.load("perplexity", module_type= "measurement")
input_texts = ["lorem ipsum", "Happy Birthday!", "Bienvenue"]
results = perplexity.compute(model_id='gpt2',
                             add_start_token=False,
                             input_texts=input_texts)
print(list(results.keys()))

[HuggingFaceDocBuilderDev]

The documentation is not available anymore as the PR was closed or merged.