ValueError while generate_videos on the jupyter notebook

[jiwonkim2020]

Hi, I was going through the jupyter notebook and got a ValueError almost at the end. How could I fix this error? (By the way, I can see the final results at the next step using CNMFViewer.)

The code block is this:

%%time
generate_videos(varr.sel(subset), Y_fm_chk, A=A, C=C_chk, vpath=dpath)

And this is the error message I received:

ValueError                                Traceback (most recent call last)
<timed eval> in <module>

~\anaconda3\envs\minian\lib\site-packages\xarray\core\dataarray.py in sel(self, indexers, method, tolerance, drop, **indexers_kwargs)
   1200 
   1201         """
-> 1202         ds = self._to_temp_dataset().sel(
   1203             indexers=indexers,
   1204             drop=drop,

~\anaconda3\envs\minian\lib\site-packages\xarray\core\dataset.py in sel(self, indexers, method, tolerance, drop, **indexers_kwargs)
   2179         DataArray.sel
   2180         """
-> 2181         indexers = either_dict_or_kwargs(indexers, indexers_kwargs, "sel")
   2182         pos_indexers, new_indexes = remap_label_indexers(
   2183             self, indexers=indexers, method=method, tolerance=tolerance

~\anaconda3\envs\minian\lib\site-packages\xarray\core\utils.py in either_dict_or_kwargs(pos_kwargs, kw_kwargs, func_name)
    267     if pos_kwargs is not None:
    268         if not is_dict_like(pos_kwargs):
--> 269             raise ValueError(
    270                 "the first argument to .%s must be a dictionary" % func_name
    271             )

ValueError: the first argument to .sel must be a dictionary

[jiwonkim2020]

I figured this out! In a previous step, I subsetted my video to drop the first frame using this: "varr.sel(frame=slice(1, None))". While I was trying to drop the first frame, I set the subset variable as something else (which is not a dictionary). Thus, I was able to solve the ValueError by using "varr.sel(frame=slice(1, None))" instead of "varr.sel(subset)".

[phildong]

thanks for sharing the experience!