Faster url concatenation and archive list flattening

pmc_open_access_figure.py

@@ -184,10 +184,10 @@ class OpenAccessFigure(datasets.GeneratorBasedBuilder):
             file_list.File = file_list.File.fillna('')
             #mask = (~file_list.File.isin(set_article)) & (file_list.File!="")
             #file_list = file_list[mask]
-            figure_url_l = [f"{_URL_ROOT}{figure_path}" for figure_path in file_list.File]
+            figure_url_l = list(_URL_ROOT + file_list.File) #[f"{_URL_ROOT}{figure_path}" for figure_path in file_list.File]
             
             try:
-                figure_archives.extend(dl_manager.download(figure_url_l))
+                figure_archives.append(dl_manager.download(figure_url_l))
                 #if l < len(incremental_file_list_l): # Only adding the incrementals to the list, the rest don't have overlap in pmid
                 #    set_article.union(file_list.File[slc_])
                 df_l.append(file_list)
@@ -195,6 +195,7 @@ class OpenAccessFigure(datasets.GeneratorBasedBuilder):
                 continue
                 
         package_df = pd.concat(df_l).reset_index()
+        figure_archives = list(chain(*figure_archives))
 
         return [
             datasets.SplitGenerator(