TypeError: data type not understood

TypeError: data type not understood

$ python -c "import numpy as np; np.array([1, 2], dtype='floatx')"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
TypeError: data type 'floatx' not understood

Why this happens

You likely passed an invalid dtype string or used a custom dtype name that NumPy doesn’t recognize. Valid dtype names include float32, float64, int32, int64, and the NumPy-provided aliases like np.int32.

Fix

Use a valid dtype name or NumPy type object. Avoid typos and deprecated aliases.

Wrong code

import numpy as np
arr = np.array([1, 2], dtype='floatx')  # typographical error

Fixed code

import numpy as np
arr = np.array([1, 2], dtype=np.float64)
# or
arr = np.array([1, 2], dtype='float64')