Implement Dataset from text
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I am wondering why only one test of "keep_in_memory=True" fails, when there are many other tests that test the same and it happens only in pyarrow_1...
2021-03-11T13:49:22Z
https://github.com/huggingface/datasets/pull/2030#issuecomment-796748285
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2021-03-11T13:49:22Z
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Implement `Dataset.from_text`.

Analogue to #1943, #1946.