Dataset changes

• New: MOROCO #2002 (@MihaelaGaman)
• New: CBT dataset #2044 (@gchhablani)
• New: MDD Dataset #2051 (@gchhablani)
• New: Multilingual dIalogAct benchMark (miam) #2047 (@eusip)
• New: bAbI QA tasks #2053 (@gchhablani)
• New: machine translated multilingual STS benchmark dataset #2090 (@PhilipMay)
• New: EURLEX legal NLP dataset #2114 (@iliaschalkidis)
• New: ECtHR legal NLP dataset #2114 (@iliaschalkidis)
• New: EU-REG-IR legal NLP dataset #2114 (@iliaschalkidis)
• New: NorNE dataset for Norwegian POS and NER #2154 (@versae)
• New: banking77 #2140 (@dkajtoch)
• New: OpenSLR #2173 #2215 #2221 (@cahya-wirawan)
• New: CUAD dataset #2219 (@bhavitvyamalik)
• Update: Gem V1.1 + new challenge sets#2142 #2186 (@yjernite)
• Update: Wikiann - added spans field #2141 (@rabeehk)
• Update: XTREME - Add tel to xtreme tatoeba #2180 (@lhoestq)
• Update: GLUE MRPC - added real label to test set #2216 (@philschmid)
• Fix: MultiWoz22 - fix dialogue action slot name and value #2136 (@adamlin120)
• Fix: wikiauto - fix link #2171 (@mounicam)
• Fix: wino_bias - use right splits #1930 (@JieyuZhao)
• Fix: lc_quad - update download checksum #2213 (@mariosasko)
• Fix newsgroup -fix one instance of 'train' to 'test' #2225 (@alexwdong)
• Fix: xnli - fix tuple key #2233 (@NikhilBartwal)

Dataset features

• Allow stateful function in dataset.map #1960 (@mariosasko)
• MIAM dataset - new citation details #2101 (@eusip)
• [Refactor] Use in-memory/memory-mapped/concatenation tables in Dataset #2025 (@lhoestq)
• Allow pickling of big in-memory tables #2150 (@lhoestq)
• updated user permissions based on umask #2086 #2157 (@bhavitvyamalik)
• Fast table queries with interpolation search #2122 (@lhoestq)
• Concat only unique fields in DatasetInfo.from_merge #2163 (@mariosasko)
• Implementation of class_encode_column #2184 #2227 (@SBrandeis)
• Add support for axis in concatenate datasets #2151 (@albertvillanova)
• Set default in-memory value depending on the dataset size #2182 (@albertvillanova)

Metrics changes

• New: CER metric #2138 (@chutaklee)
• Update: WER - Compute metric iteratively #2111 (@albertvillanova)
• Update: seqeval - configurable options to seqeval metric #2204 (@marrodion)

Dataset cards

• REFreSD: Updated card using information from data statement and datasheet #2082 (@mcmillanmajora)
• Winobiais: fix split infos #2152 (@JieyuZhao)
• all: Fix size categories in YAML Tags #2074 (@gchhablani)
• LinCE: Updating citation information on LinCE readme #2205 (@gaguilar)
• Swda: Update README.md #2235 (@PierreColombo)

General improvements and bug fixes

• Refactorize Metric.compute signature to force keyword arguments only #2079 (@albertvillanova)
• Fix max_wait_time in requests #2085 (@lhoestq)
• Fix copy snippet in docs #2091 (@mariosasko)
• Fix deprecated warning message and docstring #2100 (@albertvillanova)
• Move Dataset.to_csv to csv module #2102 (@albertvillanova)
• Fix: Allows a feature to be named "_type" #2093 (@dcfidalgo)
• copy.deepcopy os.environ instead of copy #2119 (@NihalHarish)
• Replace legacy torch.Tensor constructor with torch.tensor #2126 (@mariosasko)
• Implement Dataset as context manager #2113 (@albertvillanova)
• Fix missing infos from concurrent dataset loading #2137 (@lhoestq)
• Pin fsspec lower than 0.9.0 #2172 (@lhoestq)
• Replace assertTrue(isinstance with assertIsInstance in tests #2164 (@mariosasko)
• add social thumbnial #2177 (@philschmid)
• Fix s3fs tests for py36 and py37+ #2183 (@lhoestq)
• Fix typo in huggingface hub #2192 (@LysandreJik)
• Update metadata if dataset features are modified #2087 (@mariosasko)
• fix missing indices_files in load_form_disk #2197 (@lhoestq)
• Fix backward compatibility in Dataset.load_from_disk #2199 (@albertvillanova)
• Fix ArrowWriter overwriting features in ArrowBasedBuilder #2201 (@lhoestq)
• Fix incorrect assertion in builder.py #2110 (@dreamgonfly)
• Remove Python2 leftovers #2208 (@mariosasko)
• Revert breaking change in cache_files property #2217 (@lhoestq)
• Set test cache config #2223 (@albertvillanova)
• Fix map when removing columns on a formatted dataset #2231 (@lhoestq)
• Refactorize tests to use Dataset as context manager #2191 (@albertvillanova)
• Preserve split type when reloading dataset #2168 (@mariosasko)

Docs

• make documentation more clear to use different cloud storage #2127 (@philschmid)
• Render docstring return type as inline #2147 (@albertvillanova)
• Add table classes to the documentation #2155 (@lhoestq)
• Pin docutils for better doc #2174 (@sgugger)
• Fix docstrings issues #2081 (@albertvillanova)
• Add code of conduct to the project #2209 (@albertvillanova)
• Add classes GenerateMode, DownloadConfig and Version to the documentation #2202 (@albertvillanova)
• Fix bash snippet formatting in ADD_NEW_DATASET.md #2234 (@mariosasko)