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1. TypeError: unhashable type: 'list' when use groupby in python
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2. pymongo.errors.DocumentTooLarge: 'aggregate' command document too large
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3. elasticsearch.exceptions.RequestError: RequestError(400, 'mapper_parsing_exception', 'No handler for type [string] declared on field [texts]')
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4. the count method in python can not ignore the empty string
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5. TypeError: 'function' object is not subscriptable in tensorflow
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