Both U32 and S32 indicate that your numpy array is a string array, not a number array. Check whether there are strings in the dataset. If there are, just delete them. In numpy array, as long as one item is string, the type returned by the array is string array.
If you need to convert numpy to floating-point number, please refer to the code:
train= train.astype (float)
train_ target = train_ target.astype (float)
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