Title: Filter unsupported extensions
State: closed

I used a regex to filter the data files based on their extension for packaged builders.

I tried and a regex is 10x faster that using `in` to check if the extension is in the list of supported extensions.

Supersedes https://github.com/huggingface/datasets/pull/5850

Close https://github.com/huggingface/datasets/issues/5849

I also did a small change to favor the parquet module in case of a draw in the extension counter.

Comments: <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) | 0.006983 / 0.011353 (-0.004369) | 0.004473 / 0.011008 (-0.006535) | 0.105158 / 0.038508 (0.066650) | 0.048973 / 0.023109 (0.025864) | 0.358771 / 0.275898 (0.082873) | 0.432389 / 0.323480 (0.108909) | 0.005689 / 0.007986 (-0.002297) | 0.003584 / 0.004328 (-0.000744) | 0.080852 / 0.004250 (0.076601) | 0.066133 / 0.037052 (0.029081) | 0.370981 / 0.258489 (0.112492) | 0.406942 / 0.293841 (0.113101) | 0.032123 / 0.128546 (-0.096424) | 0.009313 / 0.075646 (-0.066333) | 0.355220 / 0.419271 (-0.064051) | 0.055768 / 0.043533 (0.012235) | 0.370545 / 0.255139 (0.115406) | 0.375619 / 0.283200 (0.092419) | 0.024258 / 0.141683 (-0.117425) | 1.559073 / 1.452155 (0.106918) | 1.616520 / 1.492716 (0.123804) |

### 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) | 0.277893 / 0.018006 (0.259887) | 0.535447 / 0.000490 (0.534957) | 0.004877 / 0.000200 (0.004677) | 0.000092 / 0.000054 (0.000037) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.029444 / 0.037411 (-0.007968) | 0.114366 / 0.014526 (0.099841) | 0.130957 / 0.176557 (-0.045599) | 0.189604 / 0.737135 (-0.547531) | 0.131682 / 0.296338 (-0.164656) |

### 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) | 0.412315 / 0.215209 (0.197106) | 4.093879 / 2.077655 (2.016225) | 1.856169 / 1.504120 (0.352050) | 1.655358 / 1.541195 (0.114164) | 1.758190 / 1.468490 (0.289699) | 0.545829 / 4.584777 (-4.038948) | 3.871436 / 3.745712 (0.125724) | 1.938244 / 5.269862 (-3.331618) | 1.122727 / 4.565676 (-3.442950) | 0.067107 / 0.424275 (-0.357168) | 0.012012 / 0.007607 (0.004405) | 0.518868 / 0.226044 (0.292824) | 5.235081 / 2.268929 (2.966153) | 2.335115 / 55.444624 (-53.109509) | 2.013074 / 6.876477 (-4.863402) | 2.219808 / 2.142072 (0.077735) | 0.674602 / 4.805227 (-4.130626) | 0.147051 / 6.500664 (-6.353613) | 0.068444 / 0.075469 (-0.007025) |

### 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) | 1.245600 / 1.841788 (-0.596188) | 15.537727 / 8.074308 (7.463419) | 15.074300 / 10.191392 (4.882908) | 0.194217 / 0.680424 (-0.486207) | 0.018536 / 0.534201 (-0.515665) | 0.437085 / 0.579283 (-0.142198) | 0.441123 / 0.434364 (0.006759) | 0.530681 / 0.540337 (-0.009657) | 0.649154 / 1.386936 (-0.737782) |

</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) | 0.007243 / 0.011353 (-0.004110) | 0.004688 / 0.011008 (-0.006320) | 0.079809 / 0.038508 (0.041301) | 0.046915 / 0.023109 (0.023805) | 0.415144 / 0.275898 (0.139246) | 0.474867 / 0.323480 (0.151388) | 0.004550 / 0.007986 (-0.003435) | 0.004585 / 0.004328 (0.000257) | 0.080837 / 0.004250 (0.076587) | 0.061667 / 0.037052 (0.024614) | 0.411321 / 0.258489 (0.152832) | 0.464195 / 0.293841 (0.170354) | 0.032510 / 0.128546 (-0.096037) | 0.009306 / 0.075646 (-0.066340) | 0.086637 / 0.419271 (-0.332635) | 0.053335 / 0.043533 (0.009802) | 0.402302 / 0.255139 (0.147163) | 0.424864 / 0.283200 (0.141664) | 0.026573 / 0.141683 (-0.115110) | 1.566793 / 1.452155 (0.114639) | 1.628118 / 1.492716 (0.135401) |

### 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) | 0.317802 / 0.018006 (0.299796) | 0.544593 / 0.000490 (0.544103) | 0.005690 / 0.000200 (0.005490) | 0.000107 / 0.000054 (0.000053) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.033015 / 0.037411 (-0.004397) | 0.121940 / 0.014526 (0.107414) | 0.132920 / 0.176557 (-0.043637) | 0.191481 / 0.737135 (-0.545655) | 0.139139 / 0.296338 (-0.157199) |

### 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) | 0.460382 / 0.215209 (0.245173) | 4.610046 / 2.077655 (2.532392) | 2.296573 / 1.504120 (0.792453) | 2.099735 / 1.541195 (0.558540) | 2.213913 / 1.468490 (0.745423) | 0.544871 / 4.584777 (-4.039906) | 3.814174 / 3.745712 (0.068462) | 3.246397 / 5.269862 (-2.023464) | 1.480236 / 4.565676 (-3.085440) | 0.068464 / 0.424275 (-0.355811) | 0.012651 / 0.007607 (0.005043) | 0.564989 / 0.226044 (0.338944) | 5.639188 / 2.268929 (3.370259) | 2.827601 / 55.444624 (-52.617023) | 2.473743 / 6.876477 (-4.402734) | 2.567413 / 2.142072 (0.425340) | 0.674351 / 4.805227 (-4.130876) | 0.146248 / 6.500664 (-6.354416) | 0.067553 / 0.075469 (-0.007916) |

### 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) | 1.346703 / 1.841788 (-0.495085) | 16.494787 / 8.074308 (8.420479) | 15.179487 / 10.191392 (4.988095) | 0.181864 / 0.680424 (-0.498560) | 0.018857 / 0.534201 (-0.515344) | 0.437787 / 0.579283 (-0.141496) | 0.431770 / 0.434364 (-0.002594) | 0.507116 / 0.540337 (-0.033221) | 0.608899 / 1.386936 (-0.778037) |

</details>
</details>

![](https://cml.dev/watermark.png#0fd5b7412f907675e76b183a6e39ef6d176fdcc0 "CML watermark")
_The documentation is not available anymore as the PR was closed or merged._<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) | 0.005963 / 0.011353 (-0.005390) | 0.003743 / 0.011008 (-0.007265) | 0.098519 / 0.038508 (0.060011) | 0.037392 / 0.023109 (0.014283) | 0.322706 / 0.275898 (0.046808) | 0.380032 / 0.323480 (0.056552) | 0.004694 / 0.007986 (-0.003292) | 0.002897 / 0.004328 (-0.001432) | 0.078664 / 0.004250 (0.074414) | 0.052646 / 0.037052 (0.015594) | 0.335523 / 0.258489 (0.077034) | 0.375464 / 0.293841 (0.081623) | 0.027537 / 0.128546 (-0.101010) | 0.008452 / 0.075646 (-0.067194) | 0.313844 / 0.419271 (-0.105427) | 0.047368 / 0.043533 (0.003835) | 0.313833 / 0.255139 (0.058694) | 0.342284 / 0.283200 (0.059085) | 0.021136 / 0.141683 (-0.120547) | 1.544764 / 1.452155 (0.092610) | 1.563850 / 1.492716 (0.071134) |

### 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) | 0.188609 / 0.018006 (0.170603) | 0.421686 / 0.000490 (0.421196) | 0.003336 / 0.000200 (0.003136) | 0.000077 / 0.000054 (0.000023) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.023678 / 0.037411 (-0.013733) | 0.099191 / 0.014526 (0.084665) | 0.105819 / 0.176557 (-0.070738) | 0.169654 / 0.737135 (-0.567481) | 0.110240 / 0.296338 (-0.186099) |

### 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) | 0.425497 / 0.215209 (0.210288) | 4.237165 / 2.077655 (2.159510) | 1.902953 / 1.504120 (0.398833) | 1.699012 / 1.541195 (0.157818) | 1.751107 / 1.468490 (0.282617) | 0.563326 / 4.584777 (-4.021451) | 3.394189 / 3.745712 (-0.351523) | 2.706129 / 5.269862 (-2.563732) | 1.361522 / 4.565676 (-3.204155) | 0.067776 / 0.424275 (-0.356499) | 0.010959 / 0.007607 (0.003352) | 0.530905 / 0.226044 (0.304860) | 5.322467 / 2.268929 (3.053538) | 2.384356 / 55.444624 (-53.060269) | 2.044196 / 6.876477 (-4.832281) | 2.119837 / 2.142072 (-0.022235) | 0.682236 / 4.805227 (-4.122991) | 0.136921 / 6.500664 (-6.363743) | 0.066784 / 0.075469 (-0.008685) |

### 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) | 1.210642 / 1.841788 (-0.631146) | 13.804572 / 8.074308 (5.730264) | 13.309229 / 10.191392 (3.117837) | 0.154356 / 0.680424 (-0.526068) | 0.016833 / 0.534201 (-0.517368) | 0.366503 / 0.579283 (-0.212780) | 0.385201 / 0.434364 (-0.049163) | 0.426713 / 0.540337 (-0.113624) | 0.516795 / 1.386936 (-0.870141) |

</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) | 0.006144 / 0.011353 (-0.005209) | 0.003723 / 0.011008 (-0.007285) | 0.077427 / 0.038508 (0.038919) | 0.037636 / 0.023109 (0.014527) | 0.375048 / 0.275898 (0.099150) | 0.442254 / 0.323480 (0.118774) | 0.003506 / 0.007986 (-0.004480) | 0.003751 / 0.004328 (-0.000577) | 0.076771 / 0.004250 (0.072521) | 0.047915 / 0.037052 (0.010862) | 0.378918 / 0.258489 (0.120429) | 0.435300 / 0.293841 (0.141459) | 0.028317 / 0.128546 (-0.100230) | 0.008413 / 0.075646 (-0.067233) | 0.082774 / 0.419271 (-0.336497) | 0.043211 / 0.043533 (-0.000321) | 0.362022 / 0.255139 (0.106883) | 0.404928 / 0.283200 (0.121728) | 0.020692 / 0.141683 (-0.120991) | 1.527303 / 1.452155 (0.075148) | 1.596091 / 1.492716 (0.103375) |

### 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) | 0.225537 / 0.018006 (0.207530) | 0.399901 / 0.000490 (0.399412) | 0.000424 / 0.000200 (0.000224) | 0.000058 / 0.000054 (0.000004) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.026483 / 0.037411 (-0.010928) | 0.104373 / 0.014526 (0.089847) | 0.111271 / 0.176557 (-0.065286) | 0.163872 / 0.737135 (-0.573264) | 0.113991 / 0.296338 (-0.182347) |

### 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) | 0.456484 / 0.215209 (0.241275) | 4.572652 / 2.077655 (2.494998) | 2.374908 / 1.504120 (0.870788) | 2.207855 / 1.541195 (0.666661) | 2.260009 / 1.468490 (0.791519) | 0.562678 / 4.584777 (-4.022099) | 3.441778 / 3.745712 (-0.303934) | 1.729006 / 5.269862 (-3.540855) | 1.024937 / 4.565676 (-3.540739) | 0.068707 / 0.424275 (-0.355568) | 0.011334 / 0.007607 (0.003727) | 0.564293 / 0.226044 (0.338248) | 5.638367 / 2.268929 (3.369438) | 2.665654 / 55.444624 (-52.778970) | 2.320033 / 6.876477 (-4.556444) | 2.328706 / 2.142072 (0.186634) | 0.677433 / 4.805227 (-4.127794) | 0.137190 / 6.500664 (-6.363474) | 0.068585 / 0.075469 (-0.006885) |

### 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) | 1.312476 / 1.841788 (-0.529312) | 14.206685 / 8.074308 (6.132377) | 14.217928 / 10.191392 (4.026536) | 0.143416 / 0.680424 (-0.537007) | 0.016647 / 0.534201 (-0.517554) | 0.361228 / 0.579283 (-0.218055) | 0.396185 / 0.434364 (-0.038178) | 0.423275 / 0.540337 (-0.117063) | 0.512966 / 1.386936 (-0.873970) |

</details>
</details>

![](https://cml.dev/watermark.png#b424648fd68bd0b5279eb916cec4836d1220e268 "CML watermark")
<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) | 0.008913 / 0.011353 (-0.002440) | 0.005142 / 0.011008 (-0.005866) | 0.133958 / 0.038508 (0.095449) | 0.049180 / 0.023109 (0.026071) | 0.389169 / 0.275898 (0.113270) | 0.481513 / 0.323480 (0.158033) | 0.006555 / 0.007986 (-0.001430) | 0.003806 / 0.004328 (-0.000522) | 0.102056 / 0.004250 (0.097806) | 0.083259 / 0.037052 (0.046207) | 0.392536 / 0.258489 (0.134047) | 0.447503 / 0.293841 (0.153662) | 0.047472 / 0.128546 (-0.081074) | 0.014748 / 0.075646 (-0.060899) | 0.475619 / 0.419271 (0.056348) | 0.107306 / 0.043533 (0.063773) | 0.421942 / 0.255139 (0.166803) | 0.419736 / 0.283200 (0.136536) | 0.044195 / 0.141683 (-0.097488) | 1.793840 / 1.452155 (0.341686) | 1.960204 / 1.492716 (0.467488) |

### 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) | 0.252046 / 0.018006 (0.234040) | 0.627725 / 0.000490 (0.627236) | 0.007435 / 0.000200 (0.007235) | 0.000526 / 0.000054 (0.000472) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.034656 / 0.037411 (-0.002755) | 0.114534 / 0.014526 (0.100008) | 0.135804 / 0.176557 (-0.040753) | 0.209309 / 0.737135 (-0.527826) | 0.140369 / 0.296338 (-0.155969) |

### 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) | 0.636736 / 0.215209 (0.421527) | 6.039985 / 2.077655 (3.962330) | 2.640141 / 1.504120 (1.136021) | 2.284492 / 1.541195 (0.743297) | 2.324956 / 1.468490 (0.856466) | 0.934499 / 4.584777 (-3.650278) | 5.673415 / 3.745712 (1.927703) | 5.184584 / 5.269862 (-0.085278) | 2.661911 / 4.565676 (-1.903766) | 0.150420 / 0.424275 (-0.273855) | 0.015655 / 0.007607 (0.008048) | 0.748290 / 0.226044 (0.522246) | 7.579755 / 2.268929 (5.310827) | 3.346732 / 55.444624 (-52.097892) | 2.708212 / 6.876477 (-4.168264) | 2.682423 / 2.142072 (0.540351) | 1.170389 / 4.805227 (-3.634838) | 0.215775 / 6.500664 (-6.284889) | 0.076360 / 0.075469 (0.000891) |

### 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) | 1.516794 / 1.841788 (-0.324993) | 18.709117 / 8.074308 (10.634809) | 22.492542 / 10.191392 (12.301150) | 0.237978 / 0.680424 (-0.442446) | 0.027828 / 0.534201 (-0.506373) | 0.499968 / 0.579283 (-0.079315) | 0.645899 / 0.434364 (0.211535) | 0.548599 / 0.540337 (0.008262) | 0.675428 / 1.386936 (-0.711508) |

</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) | 0.008469 / 0.011353 (-0.002884) | 0.005420 / 0.011008 (-0.005589) | 0.093340 / 0.038508 (0.054832) | 0.045896 / 0.023109 (0.022786) | 0.533267 / 0.275898 (0.257369) | 0.596034 / 0.323480 (0.272555) | 0.004816 / 0.007986 (-0.003170) | 0.004379 / 0.004328 (0.000051) | 0.096356 / 0.004250 (0.092106) | 0.058339 / 0.037052 (0.021287) | 0.574464 / 0.258489 (0.315975) | 0.649301 / 0.293841 (0.355461) | 0.047599 / 0.128546 (-0.080947) | 0.013759 / 0.075646 (-0.061887) | 0.104672 / 0.419271 (-0.314599) | 0.061658 / 0.043533 (0.018125) | 0.560956 / 0.255139 (0.305817) | 0.585328 / 0.283200 (0.302128) | 0.034137 / 0.141683 (-0.107546) | 1.844528 / 1.452155 (0.392373) | 1.971398 / 1.492716 (0.478682) |

### 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) | 0.278666 / 0.018006 (0.260660) | 0.577342 / 0.000490 (0.576853) | 0.005496 / 0.000200 (0.005296) | 0.000131 / 0.000054 (0.000076) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.029863 / 0.037411 (-0.007549) | 0.161703 / 0.014526 (0.147177) | 0.132279 / 0.176557 (-0.044277) | 0.227345 / 0.737135 (-0.509791) | 0.138047 / 0.296338 (-0.158291) |

### 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) | 0.651535 / 0.215209 (0.436326) | 7.077949 / 2.077655 (5.000295) | 2.926990 / 1.504120 (1.422871) | 2.598872 / 1.541195 (1.057678) | 2.614192 / 1.468490 (1.145702) | 0.913845 / 4.584777 (-3.670932) | 5.704301 / 3.745712 (1.958589) | 2.796914 / 5.269862 (-2.472948) | 1.836096 / 4.565676 (-2.729580) | 0.106294 / 0.424275 (-0.317981) | 0.012705 / 0.007607 (0.005098) | 0.836336 / 0.226044 (0.610291) | 8.234079 / 2.268929 (5.965150) | 3.836410 / 55.444624 (-51.608215) | 3.116752 / 6.876477 (-3.759724) | 3.154258 / 2.142072 (1.012186) | 1.195794 / 4.805227 (-3.609434) | 0.240491 / 6.500664 (-6.260173) | 0.087913 / 0.075469 (0.012444) |

### 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) | 1.724723 / 1.841788 (-0.117064) | 19.492194 / 8.074308 (11.417885) | 21.443341 / 10.191392 (11.251949) | 0.245819 / 0.680424 (-0.434605) | 0.027024 / 0.534201 (-0.507177) | 0.481071 / 0.579283 (-0.098212) | 0.596359 / 0.434364 (0.161995) | 0.646462 / 0.540337 (0.106124) | 0.706380 / 1.386936 (-0.680556) |

</details>
</details>

![](https://cml.dev/watermark.png#67ca664e6d5ef137127b238aae1d0aff54e22db2 "CML watermark")
<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) | 0.006634 / 0.011353 (-0.004719) | 0.004003 / 0.011008 (-0.007005) | 0.097874 / 0.038508 (0.059365) | 0.043528 / 0.023109 (0.020419) | 0.302293 / 0.275898 (0.026395) | 0.357041 / 0.323480 (0.033561) | 0.003761 / 0.007986 (-0.004225) | 0.004312 / 0.004328 (-0.000016) | 0.076253 / 0.004250 (0.072003) | 0.062807 / 0.037052 (0.025755) | 0.316737 / 0.258489 (0.058248) | 0.356722 / 0.293841 (0.062881) | 0.030816 / 0.128546 (-0.097730) | 0.008691 / 0.075646 (-0.066955) | 0.328366 / 0.419271 (-0.090906) | 0.062299 / 0.043533 (0.018766) | 0.293877 / 0.255139 (0.038738) | 0.319832 / 0.283200 (0.036632) | 0.024996 / 0.141683 (-0.116687) | 1.473912 / 1.452155 (0.021758) | 1.565439 / 1.492716 (0.072723) |

### 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) | 0.208428 / 0.018006 (0.190422) | 0.435618 / 0.000490 (0.435128) | 0.000695 / 0.000200 (0.000495) | 0.000056 / 0.000054 (0.000001) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.026253 / 0.037411 (-0.011158) | 0.106908 / 0.014526 (0.092382) | 0.117075 / 0.176557 (-0.059482) | 0.177969 / 0.737135 (-0.559166) | 0.123400 / 0.296338 (-0.172938) |

### 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) | 0.424970 / 0.215209 (0.209761) | 4.203233 / 2.077655 (2.125578) | 2.009679 / 1.504120 (0.505559) | 1.825691 / 1.541195 (0.284496) | 1.870639 / 1.468490 (0.402149) | 0.530758 / 4.584777 (-4.054019) | 3.718791 / 3.745712 (-0.026921) | 1.800206 / 5.269862 (-3.469656) | 1.071651 / 4.565676 (-3.494025) | 0.065126 / 0.424275 (-0.359149) | 0.011312 / 0.007607 (0.003704) | 0.532503 / 0.226044 (0.306458) | 5.353950 / 2.268929 (3.085021) | 2.463548 / 55.444624 (-52.981076) | 2.139832 / 6.876477 (-4.736645) | 2.238722 / 2.142072 (0.096650) | 0.655736 / 4.805227 (-4.149492) | 0.141689 / 6.500664 (-6.358975) | 0.063282 / 0.075469 (-0.012187) |

### 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) | 1.183523 / 1.841788 (-0.658265) | 14.146428 / 8.074308 (6.072120) | 14.312883 / 10.191392 (4.121491) | 0.169286 / 0.680424 (-0.511138) | 0.017343 / 0.534201 (-0.516858) | 0.397934 / 0.579283 (-0.181349) | 0.417791 / 0.434364 (-0.016573) | 0.463639 / 0.540337 (-0.076698) | 0.562787 / 1.386936 (-0.824149) |

</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) | 0.006594 / 0.011353 (-0.004759) | 0.004086 / 0.011008 (-0.006922) | 0.075122 / 0.038508 (0.036614) | 0.041849 / 0.023109 (0.018740) | 0.362645 / 0.275898 (0.086747) | 0.464350 / 0.323480 (0.140870) | 0.003760 / 0.007986 (-0.004226) | 0.003327 / 0.004328 (-0.001001) | 0.076154 / 0.004250 (0.071904) | 0.053232 / 0.037052 (0.016180) | 0.407863 / 0.258489 (0.149374) | 0.460787 / 0.293841 (0.166946) | 0.031917 / 0.128546 (-0.096630) | 0.008770 / 0.075646 (-0.066876) | 0.082612 / 0.419271 (-0.336660) | 0.051311 / 0.043533 (0.007779) | 0.354508 / 0.255139 (0.099369) | 0.419533 / 0.283200 (0.136334) | 0.023980 / 0.141683 (-0.117703) | 1.491255 / 1.452155 (0.039100) | 1.536101 / 1.492716 (0.043384) |

### 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) | 0.178261 / 0.018006 (0.160255) | 0.444680 / 0.000490 (0.444190) | 0.013761 / 0.000200 (0.013561) | 0.000117 / 0.000054 (0.000063) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.027875 / 0.037411 (-0.009536) | 0.111269 / 0.014526 (0.096744) | 0.121096 / 0.176557 (-0.055461) | 0.174387 / 0.737135 (-0.562749) | 0.124714 / 0.296338 (-0.171624) |

### 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) | 0.445422 / 0.215209 (0.230213) | 4.435877 / 2.077655 (2.358222) | 2.221895 / 1.504120 (0.717775) | 2.030571 / 1.541195 (0.489376) | 2.074863 / 1.468490 (0.606373) | 0.543331 / 4.584777 (-4.041446) | 3.753615 / 3.745712 (0.007903) | 3.317074 / 5.269862 (-1.952787) | 1.630390 / 4.565676 (-2.935286) | 0.066726 / 0.424275 (-0.357549) | 0.011556 / 0.007607 (0.003949) | 0.546985 / 0.226044 (0.320941) | 5.460634 / 2.268929 (3.191705) | 2.705945 / 55.444624 (-52.738679) | 2.373425 / 6.876477 (-4.503052) | 2.401472 / 2.142072 (0.259399) | 0.663225 / 4.805227 (-4.142002) | 0.143694 / 6.500664 (-6.356970) | 0.065283 / 0.075469 (-0.010186) |

### 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) | 1.264804 / 1.841788 (-0.576983) | 14.803228 / 8.074308 (6.728919) | 14.178514 / 10.191392 (3.987122) | 0.162651 / 0.680424 (-0.517772) | 0.017586 / 0.534201 (-0.516615) | 0.398740 / 0.579283 (-0.180543) | 0.414478 / 0.434364 (-0.019886) | 0.465442 / 0.540337 (-0.074895) | 0.563450 / 1.386936 (-0.823486) |

</details>
</details>

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