conda

Version: 1.2.2

Summary of issue
Including a @dataclass decorated class breaks getsource in show_doc

Minimal example

• Clone nbdev_tutorial
• Add new cell in 00_core.ipynb

#export
from dataclasses import dataclass

@dataclass
class Foo:
    a: int
    b: str
    c: float

• Run nbdev_build_lib
• Run nbdev_build_docs

nbdev_build_docs

hello
According to the provided tutorial, for a single image processing, the output is normal, when batch processing, the file can be detected, and the progress bar also shows the processing of the image, but the output folder /runs/predict/exp is empty. how can I solve this problem?

Is your feature request related to a problem? Please describe.
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