Hello there, uploading a dataset with a wide table annotation: test/metadata.csv · stefanches/genomic-bioimaging at main and pyarrow apparently struggles with the metadata read-in. I was able to solve it locally using pyarrow.lib.ArrowTypeError: "Expected a string or bytes object, got a 'int' obj…

Dataset preview: pyarrow.lib.ArrowTypeError: ("Expected bytes, got a 'float' object"

lhoestq November 4, 2025, 10:58am 4

I guess the issue comes from some column containing a mix of strings and floats ?

Can you check your CSV doesn’t have mixed types ?

1 Like

Topic		Replies	Views
pyarrow.lib.FloatArray: did not recognize Python value type when inferring an Arrow data type 🤗Datasets	3	5049	March 17, 2023
Pyarrow failed to parse string 🤗Datasets	5	7399	August 19, 2023
Error converting np float32 🤗Datasets	3	45	August 5, 2025
DatasetGenerationError. Failed to parse string: as a scalar of type double Beginners	3	154	January 7, 2025
Strange pyarrow error when extracting rows from a public dataset Intermediate	2	212	April 30, 2025