Learn.export() failing "PicklingError: Can't pickle <function <lambda> at 0x7f60e83e6bf8>: attribute lookup <lambda> on __main__ failed"

[andandandand (Antonio Rueda Toicen)]

Hi everyone, I’m doing some experiments with FastAI’s unet_learner in this Google Colab notebook.

I want to save my work but learn.export() is failing with the error PicklingError: Can't pickle <function <lambda> at 0x7f60e83e6bf8>: attribute lookup <lambda> on __main__ failed

Any ideas?

[muellerzr (Zachary Mueller)]

As said many times on the forums, you can’t pickle lambda functions

A quick search with your exact thread title brought this up:

Problems using learn.export(): "PicklingError: Can't pickle <function <lambda>"

Having issues trying to export a binary segmentation model using fastai’s .export() method. The model is similar to the CAMVID segmentation presented in 2019 course. Has anyone encountered this error using .export()? Are there any other options for inference? [Screen Shot 2020-09-09 at 12.24.51 am]

[andandandand (Antonio Rueda Toicen)]

Heh, my bad. Thanks, I missed that!

[asoellinger (Aaron Soellinger)]

I used pickle_protocol=dill and that worked. This is an issue where arbitrary named functions can’t be defined (or imported) to your execution context.