AttributeError: 'training_config' object has no attribute 'pretrained_'

This error message indicates that there is an attempt to access an attribute called "pretrained_" on an object of type "training_config", but such an attribute does not exist on that object.

Possible reasons for this error could include:

• The attribute was misspelled or incorrectly capitalized, so it does not match the actual attribute name on the object.
• The attribute was not properly initialized or set on the object, so it does not exist.
• The object being accessed is not of the expected type, and therefore does not have the expected attribute.

To resolve this error, you may need to review the code that is trying to access the "pretrained_" attribute and make sure that it is spelled correctly and refers to a valid attribute on the object. You may also need to check that the object being accessed is of the correct type and has the expected attributes.