ValueError: No objects to concatenate

[Aaron-WengXu]

Hi,
Uploading Pixel4_derived.csv…
ground_truth.csv

When I use "2020-06-11-US-MTV-1" (attached) collected by Pixel4 to train your neural network, I get the error "ValueError: No objects to concatenate"

For your reference:
`Processed file not found. Chunking and saving data for 2020-06-11-US-MTV-1/Pixel4
Traceback (most recent call last):
File "train_android.py", line 96, in main
dataset = Android_GNSS_Dataset(data_config)
File "/home/ling/Documents/GitHub/deep_gnss/src/correction_network/android_dataset.py", line 69, in init
self.chunk_n_save(_path, save=True)
File "/home/ling/Documents/GitHub/deep_gnss/src/correction_network/android_dataset.py", line 289, in chunk_n_save
chunk_df = pd.concat(chunk)
File "/home/ling/miniconda3/envs/deep_gnss/lib/python3.8/site-packages/pandas/core/reshape/concat.py", line 285, in concat
op = _Concatenator(
File "/home/ling/miniconda3/envs/deep_gnss/lib/python3.8/site-packages/pandas/core/reshape/concat.py", line 342, in init
raise ValueError("No objects to concatenate")
ValueError: No objects to concatenate

Set the environment variable HYDRA_FULL_ERROR=1 for a complete stack trace.
`