Release: 2.20.0


Comments:
The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_6969). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

<details>
<summary>Show benchmarks</summary>

PyArrow==8.0.0

<details>
<summary>Show updated benchmarks!</summary>

### Benchmark: benchmark_array_xd.json

| metric | read_batch_formatted_as_numpy after write_array2d | read_batch_formatted_as_numpy after write_flattened_sequence | read_batch_formatted_as_numpy after write_nested_sequence | read_batch_unformated after write_array2d | read_batch_unformated after write_flattened_sequence | read_batch_unformated after write_nested_sequence | read_col_formatted_as_numpy after write_array2d | read_col_formatted_as_numpy after write_flattened_sequence | read_col_formatted_as_numpy after write_nested_sequence | read_col_unformated after write_array2d | read_col_unformated after write_flattened_sequence | read_col_unformated after write_nested_sequence | read_formatted_as_numpy after write_array2d | read_formatted_as_numpy after write_flattened_sequence | read_formatted_as_numpy after write_nested_sequence | read_unformated after write_array2d | read_unformated after write_flattened_sequence | read_unformated after write_nested_sequence | write_array2d | write_flattened_sequence | write_nested_sequence |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.005414 / 0.011353 (-0.005939) | 0.003936 / 0.011008 (-0.007073) | 0.064129 / 0.038508 (0.025621) | 0.032985 / 0.023109 (0.009875) | 0.244051 / 0.275898 (-0.031847) | 0.273500 / 0.323480 (-0.049980) | 0.003227 / 0.007986 (-0.004759) | 0.002858 / 0.004328 (-0.001470) | 0.049212 / 0.004250 (0.044962) | 0.046432 / 0.037052 (0.009380) | 0.249543 / 0.258489 (-0.008946) | 0.297339 / 0.293841 (0.003498) | 0.027880 / 0.128546 (-0.100666) | 0.010582 / 0.075646 (-0.065065) | 0.202345 / 0.419271 (-0.216927) | 0.036402 / 0.043533 (-0.007131) | 0.253157 / 0.255139 (-0.001982) | 0.283355 / 0.283200 (0.000155) | 0.021907 / 0.141683 (-0.119776) | 1.174431 / 1.452155 (-0.277723) | 1.172103 / 1.492716 (-0.320613) |

### Benchmark: benchmark_getitem\_100B.json

| metric | get_batch_of\_1024\_random_rows | get_batch_of\_1024\_rows | get_first_row | get_last_row |
|--------|---|---|---|---|
| new / old (diff) | 0.097942 / 0.018006 (0.079936) | 0.307114 / 0.000490 (0.306624) | 0.000230 / 0.000200 (0.000030) | 0.000043 / 0.000054 (-0.000011) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.019149 / 0.037411 (-0.018262) | 0.064283 / 0.014526 (0.049758) | 0.075643 / 0.176557 (-0.100913) | 0.122531 / 0.737135 (-0.614604) | 0.077360 / 0.296338 (-0.218978) |

### Benchmark: benchmark_iterating.json

| metric | read 5000 | read 50000 | read_batch 50000 10 | read_batch 50000 100 | read_batch 50000 1000 | read_formatted numpy 5000 | read_formatted pandas 5000 | read_formatted tensorflow 5000 | read_formatted torch 5000 | read_formatted_batch numpy 5000 10 | read_formatted_batch numpy 5000 1000 | shuffled read 5000 | shuffled read 50000 | shuffled read_batch 50000 10 | shuffled read_batch 50000 100 | shuffled read_batch 50000 1000 | shuffled read_formatted numpy 5000 | shuffled read_formatted_batch numpy 5000 10 | shuffled read_formatted_batch numpy 5000 1000 |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.291790 / 0.215209 (0.076581) | 2.869234 / 2.077655 (0.791580) | 1.550266 / 1.504120 (0.046146) | 1.392392 / 1.541195 (-0.148802) | 1.375700 / 1.468490 (-0.092790) | 0.574963 / 4.584777 (-4.009814) | 2.444746 / 3.745712 (-1.300966) | 2.920602 / 5.269862 (-2.349259) | 1.812720 / 4.565676 (-2.752957) | 0.064811 / 0.424275 (-0.359464) | 0.005163 / 0.007607 (-0.002444) | 0.341306 / 0.226044 (0.115261) | 3.443177 / 2.268929 (1.174249) | 1.843510 / 55.444624 (-53.601115) | 1.534023 / 6.876477 (-5.342454) | 1.603575 / 2.142072 (-0.538498) | 0.656923 / 4.805227 (-4.148304) | 0.120338 / 6.500664 (-6.380326) | 0.042958 / 0.075469 (-0.032511) |

### Benchmark: benchmark_map_filter.json

| metric | filter | map fast-tokenizer batched | map identity | map identity batched | map no-op batched | map no-op batched numpy | map no-op batched pandas | map no-op batched pytorch | map no-op batched tensorflow |
|--------|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.975993 / 1.841788 (-0.865795) | 11.942335 / 8.074308 (3.868027) | 9.964277 / 10.191392 (-0.227115) | 0.131247 / 0.680424 (-0.549176) | 0.014166 / 0.534201 (-0.520035) | 0.283994 / 0.579283 (-0.295290) | 0.267516 / 0.434364 (-0.166848) | 0.328363 / 0.540337 (-0.211974) | 0.412204 / 1.386936 (-0.974732) |

</details>
PyArrow==latest

<details>
<summary>Show updated benchmarks!</summary>

### Benchmark: benchmark_array_xd.json

| metric | read_batch_formatted_as_numpy after write_array2d | read_batch_formatted_as_numpy after write_flattened_sequence | read_batch_formatted_as_numpy after write_nested_sequence | read_batch_unformated after write_array2d | read_batch_unformated after write_flattened_sequence | read_batch_unformated after write_nested_sequence | read_col_formatted_as_numpy after write_array2d | read_col_formatted_as_numpy after write_flattened_sequence | read_col_formatted_as_numpy after write_nested_sequence | read_col_unformated after write_array2d | read_col_unformated after write_flattened_sequence | read_col_unformated after write_nested_sequence | read_formatted_as_numpy after write_array2d | read_formatted_as_numpy after write_flattened_sequence | read_formatted_as_numpy after write_nested_sequence | read_unformated after write_array2d | read_unformated after write_flattened_sequence | read_unformated after write_nested_sequence | write_array2d | write_flattened_sequence | write_nested_sequence |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.005867 / 0.011353 (-0.005486) | 0.003860 / 0.011008 (-0.007148) | 0.050247 / 0.038508 (0.011739) | 0.033819 / 0.023109 (0.010710) | 0.264840 / 0.275898 (-0.011058) | 0.291253 / 0.323480 (-0.032227) | 0.004481 / 0.007986 (-0.003504) | 0.002880 / 0.004328 (-0.001449) | 0.048528 / 0.004250 (0.044278) | 0.041720 / 0.037052 (0.004667) | 0.280467 / 0.258489 (0.021978) | 0.315244 / 0.293841 (0.021404) | 0.030569 / 0.128546 (-0.097977) | 0.010494 / 0.075646 (-0.065152) | 0.058652 / 0.419271 (-0.360620) | 0.034181 / 0.043533 (-0.009352) | 0.266466 / 0.255139 (0.011327) | 0.292038 / 0.283200 (0.008838) | 0.018501 / 0.141683 (-0.123182) | 1.115965 / 1.452155 (-0.336189) | 1.162753 / 1.492716 (-0.329963) |

### Benchmark: benchmark_getitem\_100B.json

| metric | get_batch_of\_1024\_random_rows | get_batch_of\_1024\_rows | get_first_row | get_last_row |
|--------|---|---|---|---|
| new / old (diff) | 0.101301 / 0.018006 (0.083295) | 0.296812 / 0.000490 (0.296322) | 0.000212 / 0.000200 (0.000012) | 0.000049 / 0.000054 (-0.000006) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.023662 / 0.037411 (-0.013749) | 0.080678 / 0.014526 (0.066153) | 0.089867 / 0.176557 (-0.086689) | 0.130803 / 0.737135 (-0.606332) | 0.091479 / 0.296338 (-0.204860) |

### Benchmark: benchmark_iterating.json

| metric | read 5000 | read 50000 | read_batch 50000 10 | read_batch 50000 100 | read_batch 50000 1000 | read_formatted numpy 5000 | read_formatted pandas 5000 | read_formatted tensorflow 5000 | read_formatted torch 5000 | read_formatted_batch numpy 5000 10 | read_formatted_batch numpy 5000 1000 | shuffled read 5000 | shuffled read 50000 | shuffled read_batch 50000 10 | shuffled read_batch 50000 100 | shuffled read_batch 50000 1000 | shuffled read_formatted numpy 5000 | shuffled read_formatted_batch numpy 5000 10 | shuffled read_formatted_batch numpy 5000 1000 |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.286028 / 0.215209 (0.070819) | 2.780072 / 2.077655 (0.702418) | 1.520146 / 1.504120 (0.016026) | 1.372952 / 1.541195 (-0.168243) | 1.428734 / 1.468490 (-0.039756) | 0.571484 / 4.584777 (-4.013293) | 0.969643 / 3.745712 (-2.776069) | 2.788157 / 5.269862 (-2.481705) | 1.841166 / 4.565676 (-2.724511) | 0.063311 / 0.424275 (-0.360964) | 0.005320 / 0.007607 (-0.002287) | 0.333341 / 0.226044 (0.107296) | 3.295141 / 2.268929 (1.026213) | 1.865537 / 55.444624 (-53.579088) | 1.584655 / 6.876477 (-5.291821) | 1.747417 / 2.142072 (-0.394655) | 0.634549 / 4.805227 (-4.170678) | 0.116373 / 6.500664 (-6.384291) | 0.041567 / 0.075469 (-0.033902) |

### Benchmark: benchmark_map_filter.json

| metric | filter | map fast-tokenizer batched | map identity | map identity batched | map no-op batched | map no-op batched numpy | map no-op batched pandas | map no-op batched pytorch | map no-op batched tensorflow |
|--------|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 1.023086 / 1.841788 (-0.818702) | 13.091905 / 8.074308 (5.017597) | 10.572164 / 10.191392 (0.380772) | 0.142208 / 0.680424 (-0.538216) | 0.015692 / 0.534201 (-0.518509) | 0.284309 / 0.579283 (-0.294974) | 0.126467 / 0.434364 (-0.307897) | 0.322719 / 0.540337 (-0.217618) | 0.439952 / 1.386936 (-0.946985) |

</details>
</details>

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