Hi.
I’m trying to build a classifier with both a training and a test set. However, FastAI is throwing a UserWarning: Your training set is empty error despite the fact that both training and test sets are not empty. This is the output of my terminal commands to see how many items each folder has:
%cd Food-101/images/train/
!ls -1 | wc -l
%cd ../test
!ls -1 | wc -l
%cd ../../
/content/Food-101/images/train
75750
/content/Food-101/images/test
25250
/content/Food-101
This is my code:
import pandas as pd
from fastai import *
from fastai.vision import *
from fastai.callbacks.hooks import *
from pathlib import Path
from numba import vectorize
from subprocess import call, run
import os, git, glob, shutil
file_parse = r'/([^/]+)_\d+\.(png|jpg|jpeg)'
np.random.seed(42)
data = ImageDataBunch.from_folder(path, train='images/train', test='images/test', valid_pct=0.2, ds_tfms=get_transforms(), size=224)
data.normalize(imagenet_stats)
And this is the error:
/usr/local/lib/python3.6/dist-packages/fastai/data_block.py:458: UserWarning: Your training set is empty. If this is by design, pass `ignore_empty=True` to remove this warning.
warn("Your training set is empty. If this is by design, pass `ignore_empty=True` to remove this warning.")
/usr/local/lib/python3.6/dist-packages/fastai/data_block.py:461: UserWarning: Your validation set is empty. If this is by design, use `split_none()`
or pass `ignore_empty=True` when labelling to remove this warning.
or pass `ignore_empty=True` when labelling to remove this warning.""")
---------------------------------------------------------------------------
IndexError Traceback (most recent call last)
/usr/local/lib/python3.6/dist-packages/fastai/data_block.py in get_label_cls(self, labels, label_cls, label_delim, **kwargs)
264 if label_delim is not None: return MultiCategoryList
--> 265 try: it = index_row(labels,0)
266 except: raise Exception("""Can't infer the type of your targets.
7 frames
IndexError: index 0 is out of bounds for axis 0 with size 0
During handling of the above exception, another exception occurred:
Exception Traceback (most recent call last)
/usr/local/lib/python3.6/dist-packages/fastai/data_block.py in get_label_cls(self, labels, label_cls, label_delim, **kwargs)
265 try: it = index_row(labels,0)
266 except: raise Exception("""Can't infer the type of your targets.
--> 267 It's either because your data source is empty or because your labelling function raised an error.""")
268 if isinstance(it, (float, np.float32)): return FloatList
269 if isinstance(try_int(it), (str, Integral)): return CategoryList
Exception: Can't infer the type of your targets.
It's either because your data source is empty or because your labelling function raised an error.
I do not understand why it throws this error when both directories are clearly populated with images.