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並前往https://www.analyticsvidhya.com/blog/2021/04/how-to-manipulate-a-20g-csv-file-efficiently/

How to manipulate a 20G CSV file efficiently? - Analytics Vidhya

apply is slow, even for a 436MB CSV file, it still took 1m6s to finish. To make it faster, we can convert the DataFrame into NumPy array, and ...

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