AssertionError: expect 202335260 bytes, found 203934260 Soccer Ball Detection using YOLOv2 (Darkflow) - assertion

Question

https://github.com/deep-diver/Soccer-Ball-Detection-YOLOv2
I get loading yolo.weights .... and then
AssertionError: expect 202335260 bytes, found 203934260
However, when I run the same command with default dataset it works. I downloaded the weights file from https://drive.google.com/drive/folders/0B1tW_VtY7onidEwyQ2FtQVplWEU
I modify the line self.offset = 16 in the ./darkflow/utils/loader.py file and replace with self.offset = 20. But can not solve the issue.
How I can solve this issue?

Answer 1

Just to add to # Zrufy's answer In darkflow/utils/loader.py
class weights_walker(object):
"""incremental reader of float32 binary files"""
def __init__(self, path):
self.eof = False # end of file
self.path = path # current pos
if path is None:
self.eof = True
return
else:
self.size = os.path.getsize(path)# save the path
major, minor, revision, seen = np.memmap(path,
shape = (), mode = 'r', offset = 0,
dtype = '({})i4,'.format(4))
self.transpose = major > 1000 or minor > 1000
self.offset = 16 + 203934260 - 202335260
Make the change so that the last line is of the form
self.offset = 16 + found_value - expected_value
found_value and expected_value can be taken from the assertion error that you face.

Answer 2

I got the same problem, and solved it with Ign0reLee's help.
You can find the detail in https://github.com/deep-diver/Soccer-Ball-Detection-YOLOv2/issues/3
Basically, it happened when your network configuration (.cfg) and weight file (.weights) mismatch., I think the cfg file in this repo is not correct for the official weight file.
Please try this weight file
https://pjreddie.com/media/files/yolov2.weights
with this cfg file Ign0reLee put in the issue page
Wish you luck

Answer 3

the method in which you need to change from 16 to 20 the self.offset does not work.
The only working method for this bug is:
updated self.offset = old_offset_value + (found_value - expected_value)
for example in your case put in place in self.offset instead of 16 this:
16+(203934260-202314760)
let me know!