Create_func removed from data_block

Part 1 (2019)
1

I noticed that the create_func argument was removed from the datablock. Is there another way to do this now through another method? Would there be an example of this?

2

from the changes.md in the repo for version 1.0.28 this is listed as breaking change:

  • create_func is removed in the data API; subclass and change the get method instead (in vision, you can subclass the open method if you want to change how the images are opened).

Just remembered that I read that a few days ago, have not tried myself but maybe it points you in the right direction…

I have found it helpful to check this document often lately, lots of things breaking… :wink:

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3

That’s exactly what I needed. My only regret is that I have just one like to give.

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4

In case anybody else has this issue, here is what my code looks like to fix it:

Here is the create_func that was being used (This is from Radek’s Quickdraw Starter):

def create_func(path):
    with open(path) as f: j = json.load(f)
    drawing = list2drawing(j['drawing'], size=sz)
    tensor = drawing2tensor(drawing)
    return Image(tensor.div_(255))

What I had to use is:

class JSONImageItemList(ImageItemList):
    def open(self,fn):
        with io.open(fn) as f: j = json.load(f)
        drawing = list2drawing(j['drawing'], size=sz)
        tensor = drawing2tensor(drawing)
        return Image(tensor.div_(255))

So I had to import io so I could do io.open, but besides that, I didn’t have to change anything else. Here is what my item_list call looks like now:

item_list = JSONImageItemList.from_folder(PATH/'train', extensions=[".txt"])

Hopefully this can help somebody else that is having similar issues.

5 Likes