Add `date_format` param to the CSV reader
State: closed

Adds the `date_format` param introduced in Pandas 2.0 to the CSV reader and improves its type hints.

_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) | 0.007592 / 0.011353 (-0.003761) | 0.005223 / 0.011008 (-0.005786) | 0.110218 / 0.038508 (0.071710) | 0.027644 / 0.023109 (0.004534) | 0.335063 / 0.275898 (0.059165) | 0.347102 / 0.323480 (0.023623) | 0.005107 / 0.007986 (-0.002878) | 0.003932 / 0.004328 (-0.000396) | 0.086095 / 0.004250 (0.081845) | 0.034735 / 0.037052 (-0.002317) | 0.329029 / 0.258489 (0.070540) | 0.370282 / 0.293841 (0.076441) | 0.043040 / 0.128546 (-0.085507) | 0.019626 / 0.075646 (-0.056021) | 0.336452 / 0.419271 (-0.082819) | 0.070365 / 0.043533 (0.026832) | 0.326881 / 0.255139 (0.071742) | 0.354984 / 0.283200 (0.071785) | 0.102605 / 0.141683 (-0.039077) | 1.459161 / 1.452155 (0.007007) | 1.453599 / 1.492716 (-0.039117) |

### 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) | 0.201021 / 0.018006 (0.183015) | 0.456415 / 0.000490 (0.455926) | 0.012349 / 0.000200 (0.012149) | 0.000115 / 0.000054 (0.000061) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.025199 / 0.037411 (-0.012213) | 0.098536 / 0.014526 (0.084010) | 0.107528 / 0.176557 (-0.069028) | 0.160492 / 0.737135 (-0.576643) | 0.108660 / 0.296338 (-0.187679) |

### 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) | 0.527020 / 0.215209 (0.311811) | 5.357635 / 2.077655 (3.279980) | 2.062930 / 1.504120 (0.558811) | 1.783009 / 1.541195 (0.241815) | 1.840225 / 1.468490 (0.371735) | 1.074278 / 4.584777 (-3.510499) | 4.710533 / 3.745712 (0.964821) | 2.611202 / 5.269862 (-2.658660) | 1.885487 / 4.565676 (-2.680189) | 0.123201 / 0.424275 (-0.301074) | 0.013880 / 0.007607 (0.006273) | 0.636511 / 0.226044 (0.410467) | 6.516075 / 2.268929 (4.247146) | 2.710138 / 55.444624 (-52.734486) | 2.046606 / 6.876477 (-4.829871) | 2.085907 / 2.142072 (-0.056166) | 1.199489 / 4.805227 (-3.605738) | 0.211668 / 6.500664 (-6.288996) | 0.075436 / 0.075469 (-0.000033) |

### 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) | 1.219771 / 1.841788 (-0.622016) | 14.276215 / 8.074308 (6.201907) | 16.611529 / 10.191392 (6.420137) | 0.221091 / 0.680424 (-0.459333) | 0.024922 / 0.534201 (-0.509279) | 0.431906 / 0.579283 (-0.147377) | 0.518863 / 0.434364 (0.084499) | 0.515366 / 0.540337 (-0.024971) | 0.640411 / 1.386936 (-0.746525) |

</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) | 0.007955 / 0.011353 (-0.003398) | 0.004813 / 0.011008 (-0.006196) | 0.076508 / 0.038508 (0.038000) | 0.028137 / 0.023109 (0.005028) | 0.349609 / 0.275898 (0.073711) | 0.403588 / 0.323480 (0.080109) | 0.005456 / 0.007986 (-0.002530) | 0.005677 / 0.004328 (0.001349) | 0.076882 / 0.004250 (0.072632) | 0.039832 / 0.037052 (0.002779) | 0.351930 / 0.258489 (0.093440) | 0.390492 / 0.293841 (0.096651) | 0.045199 / 0.128546 (-0.083347) | 0.023945 / 0.075646 (-0.051701) | 0.091140 / 0.419271 (-0.328132) | 0.057728 / 0.043533 (0.014195) | 0.370663 / 0.255139 (0.115524) | 0.380649 / 0.283200 (0.097449) | 0.097017 / 0.141683 (-0.044666) | 1.362248 / 1.452155 (-0.089907) | 1.445699 / 1.492716 (-0.047018) |

### 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) | 0.204207 / 0.018006 (0.186201) | 0.474471 / 0.000490 (0.473981) | 0.012187 / 0.000200 (0.011987) | 0.000151 / 0.000054 (0.000096) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.023123 / 0.037411 (-0.014288) | 0.097547 / 0.014526 (0.083021) | 0.113877 / 0.176557 (-0.062679) | 0.158307 / 0.737135 (-0.578828) | 0.113876 / 0.296338 (-0.182462) |

### 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) | 0.519920 / 0.215209 (0.304711) | 5.384371 / 2.077655 (3.306716) | 2.263276 / 1.504120 (0.759156) | 1.960604 / 1.541195 (0.419409) | 2.022864 / 1.468490 (0.554374) | 1.015430 / 4.584777 (-3.569347) | 4.774426 / 3.745712 (1.028714) | 4.549598 / 5.269862 (-0.720264) | 2.412638 / 4.565676 (-2.153039) | 0.117983 / 0.424275 (-0.306292) | 0.013340 / 0.007607 (0.005733) | 0.639826 / 0.226044 (0.413782) | 6.491622 / 2.268929 (4.222693) | 2.946892 / 55.444624 (-52.497732) | 2.376393 / 6.876477 (-4.500084) | 2.285592 / 2.142072 (0.143519) | 1.185049 / 4.805227 (-3.620178) | 0.204127 / 6.500664 (-6.296537) | 0.070285 / 0.075469 (-0.005184) |

### 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) | 1.439736 / 1.841788 (-0.402052) | 14.852087 / 8.074308 (6.777779) | 15.675742 / 10.191392 (5.484350) | 0.206577 / 0.680424 (-0.473846) | 0.031688 / 0.534201 (-0.502513) | 0.471003 / 0.579283 (-0.108280) | 0.505449 / 0.434364 (0.071085) | 0.506114 / 0.540337 (-0.034224) | 0.583752 / 1.386936 (-0.803184) |

</details>
</details>

![](https://cml.dev/watermark.png#d6fcff8a031db39cb31079bc1fa62ded6e35218c "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) | 0.012965 / 0.011353 (0.001612) | 0.006660 / 0.011008 (-0.004348) | 0.126060 / 0.038508 (0.087551) | 0.041154 / 0.023109 (0.018045) | 0.413428 / 0.275898 (0.137530) | 0.429035 / 0.323480 (0.105555) | 0.006680 / 0.007986 (-0.001305) | 0.005063 / 0.004328 (0.000734) | 0.092161 / 0.004250 (0.087911) | 0.056092 / 0.037052 (0.019039) | 0.421460 / 0.258489 (0.162971) | 0.450291 / 0.293841 (0.156450) | 0.050820 / 0.128546 (-0.077726) | 0.021392 / 0.075646 (-0.054255) | 0.426915 / 0.419271 (0.007643) | 0.064908 / 0.043533 (0.021375) | 0.406769 / 0.255139 (0.151630) | 0.434344 / 0.283200 (0.151144) | 0.127967 / 0.141683 (-0.013716) | 1.922414 / 1.452155 (0.470260) | 1.940717 / 1.492716 (0.448000) |

### 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) | 0.288024 / 0.018006 (0.270017) | 0.615859 / 0.000490 (0.615369) | 0.007095 / 0.000200 (0.006895) | 0.000160 / 0.000054 (0.000106) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.028182 / 0.037411 (-0.009230) | 0.126277 / 0.014526 (0.111752) | 0.131687 / 0.176557 (-0.044870) | 0.206191 / 0.737135 (-0.530944) | 0.141799 / 0.296338 (-0.154539) |

### 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) | 0.631580 / 0.215209 (0.416371) | 6.141942 / 2.077655 (4.064287) | 2.476721 / 1.504120 (0.972602) | 2.128850 / 1.541195 (0.587655) | 2.236468 / 1.468490 (0.767978) | 1.188665 / 4.584777 (-3.396112) | 5.481179 / 3.745712 (1.735467) | 3.120333 / 5.269862 (-2.149529) | 2.365889 / 4.565676 (-2.199787) | 0.145081 / 0.424275 (-0.279194) | 0.015866 / 0.007607 (0.008259) | 0.795650 / 0.226044 (0.569605) | 7.595289 / 2.268929 (5.326361) | 3.174418 / 55.444624 (-52.270207) | 2.905207 / 6.876477 (-3.971270) | 2.428263 / 2.142072 (0.286191) | 1.408900 / 4.805227 (-3.396328) | 0.265485 / 6.500664 (-6.235179) | 0.083882 / 0.075469 (0.008413) |

### 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) | 1.517025 / 1.841788 (-0.324762) | 18.110288 / 8.074308 (10.035980) | 20.810003 / 10.191392 (10.618611) | 0.210380 / 0.680424 (-0.470044) | 0.030180 / 0.534201 (-0.504021) | 0.523453 / 0.579283 (-0.055830) | 0.603896 / 0.434364 (0.169532) | 0.622554 / 0.540337 (0.082216) | 0.737973 / 1.386936 (-0.648963) |

</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) | 0.009795 / 0.011353 (-0.001558) | 0.006269 / 0.011008 (-0.004739) | 0.099938 / 0.038508 (0.061430) | 0.035162 / 0.023109 (0.012052) | 0.506353 / 0.275898 (0.230455) | 0.527804 / 0.323480 (0.204324) | 0.007211 / 0.007986 (-0.000775) | 0.005498 / 0.004328 (0.001169) | 0.098325 / 0.004250 (0.094075) | 0.054513 / 0.037052 (0.017461) | 0.525764 / 0.258489 (0.267274) | 0.576699 / 0.293841 (0.282858) | 0.052800 / 0.128546 (-0.075747) | 0.021192 / 0.075646 (-0.054454) | 0.117676 / 0.419271 (-0.301596) | 0.055415 / 0.043533 (0.011882) | 0.516746 / 0.255139 (0.261607) | 0.528417 / 0.283200 (0.245217) | 0.116947 / 0.141683 (-0.024735) | 1.757864 / 1.452155 (0.305709) | 2.043632 / 1.492716 (0.550916) |

### 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) | 0.284018 / 0.018006 (0.266011) | 0.595086 / 0.000490 (0.594596) | 0.001945 / 0.000200 (0.001745) | 0.000127 / 0.000054 (0.000073) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.032255 / 0.037411 (-0.005157) | 0.128201 / 0.014526 (0.113676) | 0.139189 / 0.176557 (-0.037367) | 0.199750 / 0.737135 (-0.537385) | 0.149406 / 0.296338 (-0.146933) |

### 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) | 0.652184 / 0.215209 (0.436975) | 6.453319 / 2.077655 (4.375664) | 2.831566 / 1.504120 (1.327446) | 2.453064 / 1.541195 (0.911869) | 2.622056 / 1.468490 (1.153566) | 1.191279 / 4.584777 (-3.393498) | 5.504720 / 3.745712 (1.759007) | 5.916900 / 5.269862 (0.647038) | 2.974400 / 4.565676 (-1.591277) | 0.142851 / 0.424275 (-0.281424) | 0.015241 / 0.007607 (0.007634) | 0.917537 / 0.226044 (0.691493) | 8.277645 / 2.268929 (6.008717) | 3.700495 / 55.444624 (-51.744130) | 3.047127 / 6.876477 (-3.829350) | 3.093216 / 2.142072 (0.951143) | 1.413529 / 4.805227 (-3.391698) | 0.259395 / 6.500664 (-6.241270) | 0.083144 / 0.075469 (0.007675) |

### 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) | 1.632240 / 1.841788 (-0.209548) | 18.687403 / 8.074308 (10.613095) | 20.134091 / 10.191392 (9.942699) | 0.238792 / 0.680424 (-0.441632) | 0.027645 / 0.534201 (-0.506556) | 0.518200 / 0.579283 (-0.061083) | 0.613535 / 0.434364 (0.179171) | 0.631414 / 0.540337 (0.091076) | 0.724658 / 1.386936 (-0.662278) |

</details>
</details>

![](https://cml.dev/watermark.png#ac7caa5e195ad76c7e8ef98914813383f4f668cf "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) | 0.006228 / 0.011353 (-0.005125) | 0.004517 / 0.011008 (-0.006492) | 0.097998 / 0.038508 (0.059490) | 0.027903 / 0.023109 (0.004793) | 0.309789 / 0.275898 (0.033891) | 0.332784 / 0.323480 (0.009304) | 0.004757 / 0.007986 (-0.003228) | 0.003348 / 0.004328 (-0.000981) | 0.075193 / 0.004250 (0.070942) | 0.037382 / 0.037052 (0.000330) | 0.306929 / 0.258489 (0.048440) | 0.347304 / 0.293841 (0.053463) | 0.030235 / 0.128546 (-0.098312) | 0.011516 / 0.075646 (-0.064131) | 0.322249 / 0.419271 (-0.097023) | 0.044125 / 0.043533 (0.000592) | 0.303874 / 0.255139 (0.048735) | 0.326808 / 0.283200 (0.043608) | 0.088137 / 0.141683 (-0.053546) | 1.521426 / 1.452155 (0.069272) | 1.573823 / 1.492716 (0.081107) |

### 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) | 0.203204 / 0.018006 (0.185197) | 0.402247 / 0.000490 (0.401757) | 0.003146 / 0.000200 (0.002946) | 0.000088 / 0.000054 (0.000034) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.022955 / 0.037411 (-0.014456) | 0.096059 / 0.014526 (0.081533) | 0.105552 / 0.176557 (-0.071004) | 0.167459 / 0.737135 (-0.569676) | 0.106723 / 0.296338 (-0.189615) |

### 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) | 0.454626 / 0.215209 (0.239417) | 4.556346 / 2.077655 (2.478691) | 2.220349 / 1.504120 (0.716229) | 2.011820 / 1.541195 (0.470625) | 2.048149 / 1.468490 (0.579659) | 0.697583 / 4.584777 (-3.887194) | 3.428394 / 3.745712 (-0.317318) | 1.863872 / 5.269862 (-3.405989) | 1.159691 / 4.565676 (-3.405985) | 0.082598 / 0.424275 (-0.341677) | 0.012202 / 0.007607 (0.004594) | 0.555617 / 0.226044 (0.329572) | 5.545481 / 2.268929 (3.276553) | 2.650850 / 55.444624 (-52.793775) | 2.305864 / 6.876477 (-4.570613) | 2.392252 / 2.142072 (0.250179) | 0.808512 / 4.805227 (-3.996716) | 0.152086 / 6.500664 (-6.348578) | 0.066440 / 0.075469 (-0.009029) |

### 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) | 1.211789 / 1.841788 (-0.629999) | 13.515546 / 8.074308 (5.441238) | 13.859870 / 10.191392 (3.668478) | 0.150335 / 0.680424 (-0.530088) | 0.016578 / 0.534201 (-0.517623) | 0.379145 / 0.579283 (-0.200138) | 0.393735 / 0.434364 (-0.040628) | 0.460219 / 0.540337 (-0.080118) | 0.555896 / 1.386936 (-0.831040) |

</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) | 0.006402 / 0.011353 (-0.004950) | 0.004558 / 0.011008 (-0.006450) | 0.077332 / 0.038508 (0.038824) | 0.027955 / 0.023109 (0.004846) | 0.407877 / 0.275898 (0.131979) | 0.432552 / 0.323480 (0.109072) | 0.004850 / 0.007986 (-0.003135) | 0.003329 / 0.004328 (-0.000999) | 0.075767 / 0.004250 (0.071517) | 0.035940 / 0.037052 (-0.001112) | 0.419544 / 0.258489 (0.161055) | 0.454672 / 0.293841 (0.160831) | 0.030461 / 0.128546 (-0.098085) | 0.011536 / 0.075646 (-0.064111) | 0.085774 / 0.419271 (-0.333498) | 0.039408 / 0.043533 (-0.004125) | 0.389909 / 0.255139 (0.134770) | 0.403287 / 0.283200 (0.120088) | 0.088385 / 0.141683 (-0.053298) | 1.596840 / 1.452155 (0.144686) | 1.659296 / 1.492716 (0.166580) |

### 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) | 0.216349 / 0.018006 (0.198342) | 0.394969 / 0.000490 (0.394479) | 0.000408 / 0.000200 (0.000208) | 0.000059 / 0.000054 (0.000005) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.024346 / 0.037411 (-0.013066) | 0.099609 / 0.014526 (0.085084) | 0.106779 / 0.176557 (-0.069778) | 0.156889 / 0.737135 (-0.580247) | 0.110625 / 0.296338 (-0.185714) |

### 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) | 0.443809 / 0.215209 (0.228600) | 4.450524 / 2.077655 (2.372870) | 2.151694 / 1.504120 (0.647574) | 1.952521 / 1.541195 (0.411326) | 1.963320 / 1.468490 (0.494830) | 0.709291 / 4.584777 (-3.875486) | 3.415708 / 3.745712 (-0.330005) | 1.850498 / 5.269862 (-3.419363) | 1.164355 / 4.565676 (-3.401321) | 0.084977 / 0.424275 (-0.339298) | 0.013284 / 0.007607 (0.005677) | 0.555103 / 0.226044 (0.329059) | 5.583587 / 2.268929 (3.314658) | 2.608754 / 55.444624 (-52.835870) | 2.264079 / 6.876477 (-4.612398) | 2.272455 / 2.142072 (0.130382) | 0.820849 / 4.805227 (-3.984379) | 0.155063 / 6.500664 (-6.345601) | 0.069709 / 0.075469 (-0.005760) |

### 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) | 1.293285 / 1.841788 (-0.548503) | 14.181867 / 8.074308 (6.107559) | 13.021280 / 10.191392 (2.829888) | 0.130101 / 0.680424 (-0.550323) | 0.016461 / 0.534201 (-0.517740) | 0.383651 / 0.579283 (-0.195632) | 0.387353 / 0.434364 (-0.047011) | 0.443351 / 0.540337 (-0.096986) | 0.529448 / 1.386936 (-0.857488) |

</details>
</details>

![](https://cml.dev/watermark.png#05145d50b5bb1b7b42b76516cd6492d4868c46ba "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) | 0.007513 / 0.011353 (-0.003840) | 0.005328 / 0.011008 (-0.005680) | 0.096937 / 0.038508 (0.058429) | 0.036230 / 0.023109 (0.013121) | 0.325808 / 0.275898 (0.049910) | 0.363601 / 0.323480 (0.040121) | 0.006130 / 0.007986 (-0.001855) | 0.004352 / 0.004328 (0.000023) | 0.073543 / 0.004250 (0.069293) | 0.054114 / 0.037052 (0.017062) | 0.328952 / 0.258489 (0.070463) | 0.366943 / 0.293841 (0.073102) | 0.035768 / 0.128546 (-0.092778) | 0.012505 / 0.075646 (-0.063142) | 0.332260 / 0.419271 (-0.087012) | 0.066673 / 0.043533 (0.023140) | 0.323866 / 0.255139 (0.068727) | 0.341311 / 0.283200 (0.058112) | 0.129898 / 0.141683 (-0.011785) | 1.456890 / 1.452155 (0.004735) | 1.546933 / 1.492716 (0.054217) |

### 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) | 0.299236 / 0.018006 (0.281229) | 0.496134 / 0.000490 (0.495645) | 0.004233 / 0.000200 (0.004033) | 0.000081 / 0.000054 (0.000027) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.028089 / 0.037411 (-0.009322) | 0.104723 / 0.014526 (0.090197) | 0.121032 / 0.176557 (-0.055525) | 0.179916 / 0.737135 (-0.557220) | 0.126628 / 0.296338 (-0.169711) |

### 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) | 0.403497 / 0.215209 (0.188288) | 4.052481 / 2.077655 (1.974827) | 1.804419 / 1.504120 (0.300299) | 1.619833 / 1.541195 (0.078638) | 1.732438 / 1.468490 (0.263948) | 0.702474 / 4.584777 (-3.882303) | 3.808973 / 3.745712 (0.063261) | 3.682764 / 5.269862 (-1.587098) | 1.919184 / 4.565676 (-2.646493) | 0.086638 / 0.424275 (-0.337637) | 0.012265 / 0.007607 (0.004658) | 0.501273 / 0.226044 (0.275229) | 5.010918 / 2.268929 (2.741989) | 2.278114 / 55.444624 (-53.166510) | 1.942266 / 6.876477 (-4.934211) | 2.101982 / 2.142072 (-0.040091) | 0.847622 / 4.805227 (-3.957606) | 0.172973 / 6.500664 (-6.327691) | 0.066884 / 0.075469 (-0.008586) |

### 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) | 1.187609 / 1.841788 (-0.654179) | 15.089485 / 8.074308 (7.015177) | 14.787398 / 10.191392 (4.596006) | 0.168254 / 0.680424 (-0.512170) | 0.018266 / 0.534201 (-0.515935) | 0.423204 / 0.579283 (-0.156079) | 0.435238 / 0.434364 (0.000874) | 0.512473 / 0.540337 (-0.027864) | 0.618091 / 1.386936 (-0.768845) |

</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) | 0.007249 / 0.011353 (-0.004104) | 0.005297 / 0.011008 (-0.005711) | 0.076428 / 0.038508 (0.037920) | 0.033565 / 0.023109 (0.010456) | 0.373756 / 0.275898 (0.097858) | 0.407405 / 0.323480 (0.083925) | 0.006100 / 0.007986 (-0.001886) | 0.006482 / 0.004328 (0.002153) | 0.075884 / 0.004250 (0.071633) | 0.055338 / 0.037052 (0.018286) | 0.378721 / 0.258489 (0.120232) | 0.427065 / 0.293841 (0.133224) | 0.036285 / 0.128546 (-0.092261) | 0.012460 / 0.075646 (-0.063186) | 0.087641 / 0.419271 (-0.331630) | 0.048199 / 0.043533 (0.004666) | 0.386785 / 0.255139 (0.131646) | 0.386702 / 0.283200 (0.103503) | 0.110087 / 0.141683 (-0.031596) | 1.511204 / 1.452155 (0.059050) | 1.585671 / 1.492716 (0.092954) |

### 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) | 0.313558 / 0.018006 (0.295552) | 0.496991 / 0.000490 (0.496501) | 0.001492 / 0.000200 (0.001292) | 0.000093 / 0.000054 (0.000038) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.031814 / 0.037411 (-0.005597) | 0.113486 / 0.014526 (0.098960) | 0.125208 / 0.176557 (-0.051348) | 0.174469 / 0.737135 (-0.562666) | 0.131095 / 0.296338 (-0.165244) |

### 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) | 0.439282 / 0.215209 (0.224073) | 4.362286 / 2.077655 (2.284631) | 2.153271 / 1.504120 (0.649151) | 1.990482 / 1.541195 (0.449288) | 2.103322 / 1.468490 (0.634831) | 0.692522 / 4.584777 (-3.892254) | 3.861931 / 3.745712 (0.116219) | 3.686294 / 5.269862 (-1.583567) | 1.734525 / 4.565676 (-2.831152) | 0.085057 / 0.424275 (-0.339218) | 0.012116 / 0.007607 (0.004509) | 0.547996 / 0.226044 (0.321952) | 5.513835 / 2.268929 (3.244906) | 2.723829 / 55.444624 (-52.720795) | 2.404715 / 6.876477 (-4.471761) | 2.514768 / 2.142072 (0.372696) | 0.834972 / 4.805227 (-3.970255) | 0.168261 / 6.500664 (-6.332403) | 0.066464 / 0.075469 (-0.009005) |

### 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) | 1.259923 / 1.841788 (-0.581865) | 15.646277 / 8.074308 (7.571969) | 13.097598 / 10.191392 (2.906206) | 0.187991 / 0.680424 (-0.492433) | 0.017358 / 0.534201 (-0.516843) | 0.427979 / 0.579283 (-0.151304) | 0.425747 / 0.434364 (-0.008617) | 0.501907 / 0.540337 (-0.038431) | 0.595106 / 1.386936 (-0.791830) |

</details>
</details>

![](https://cml.dev/watermark.png#db56f7f0d2f0b99af4da17d388c205152504c7d9 "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) | 0.009378 / 0.011353 (-0.001975) | 0.006434 / 0.011008 (-0.004574) | 0.120603 / 0.038508 (0.082095) | 0.042929 / 0.023109 (0.019820) | 0.366853 / 0.275898 (0.090955) | 0.436795 / 0.323480 (0.113315) | 0.007730 / 0.007986 (-0.000256) | 0.004842 / 0.004328 (0.000513) | 0.091058 / 0.004250 (0.086808) | 0.058256 / 0.037052 (0.021203) | 0.378692 / 0.258489 (0.120203) | 0.467384 / 0.293841 (0.173543) | 0.042948 / 0.128546 (-0.085598) | 0.015172 / 0.075646 (-0.060475) | 0.409225 / 0.419271 (-0.010046) | 0.083672 / 0.043533 (0.040140) | 0.390088 / 0.255139 (0.134949) | 0.406965 / 0.283200 (0.123765) | 0.142132 / 0.141683 (0.000449) | 1.765737 / 1.452155 (0.313582) | 1.895419 / 1.492716 (0.402703) |

### 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) | 0.244052 / 0.018006 (0.226046) | 0.553383 / 0.000490 (0.552893) | 0.006798 / 0.000200 (0.006598) | 0.000227 / 0.000054 (0.000173) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.032032 / 0.037411 (-0.005380) | 0.129990 / 0.014526 (0.115464) | 0.140338 / 0.176557 (-0.036219) | 0.212155 / 0.737135 (-0.524980) | 0.147395 / 0.296338 (-0.148943) |

### 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) | 0.478760 / 0.215209 (0.263551) | 4.751335 / 2.077655 (2.673680) | 2.164755 / 1.504120 (0.660635) | 1.944288 / 1.541195 (0.403094) | 2.077657 / 1.468490 (0.609167) | 0.818519 / 4.584777 (-3.766258) | 4.689013 / 3.745712 (0.943301) | 2.484079 / 5.269862 (-2.785782) | 1.788632 / 4.565676 (-2.777044) | 0.100484 / 0.424275 (-0.323791) | 0.013838 / 0.007607 (0.006231) | 0.589650 / 0.226044 (0.363605) | 5.859461 / 2.268929 (3.590533) | 2.670025 / 55.444624 (-52.774599) | 2.688709 / 6.876477 (-4.187768) | 2.408060 / 2.142072 (0.265988) | 0.972107 / 4.805227 (-3.833120) | 0.194425 / 6.500664 (-6.306239) | 0.076077 / 0.075469 (0.000608) |

### 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) | 1.430150 / 1.841788 (-0.411638) | 17.710507 / 8.074308 (9.636199) | 16.210789 / 10.191392 (6.019397) | 0.163940 / 0.680424 (-0.516484) | 0.020295 / 0.534201 (-0.513906) | 0.472596 / 0.579283 (-0.106687) | 0.483107 / 0.434364 (0.048743) | 0.585269 / 0.540337 (0.044931) | 0.705526 / 1.386936 (-0.681410) |

</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) | 0.008864 / 0.011353 (-0.002489) | 0.006095 / 0.011008 (-0.004913) | 0.088702 / 0.038508 (0.050194) | 0.041596 / 0.023109 (0.018486) | 0.453515 / 0.275898 (0.177617) | 0.476217 / 0.323480 (0.152737) | 0.007574 / 0.007986 (-0.000412) | 0.004727 / 0.004328 (0.000398) | 0.087271 / 0.004250 (0.083021) | 0.059631 / 0.037052 (0.022578) | 0.449379 / 0.258489 (0.190890) | 0.494436 / 0.293841 (0.200595) | 0.043448 / 0.128546 (-0.085098) | 0.014580 / 0.075646 (-0.061067) | 0.103836 / 0.419271 (-0.315435) | 0.057537 / 0.043533 (0.014004) | 0.449359 / 0.255139 (0.194220) | 0.447577 / 0.283200 (0.164377) | 0.123600 / 0.141683 (-0.018083) | 1.748448 / 1.452155 (0.296294) | 1.902116 / 1.492716 (0.409399) |

### 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) | 0.237214 / 0.018006 (0.219207) | 0.497648 / 0.000490 (0.497158) | 0.003519 / 0.000200 (0.003319) | 0.000112 / 0.000054 (0.000058) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.034477 / 0.037411 (-0.002934) | 0.132627 / 0.014526 (0.118101) | 0.139721 / 0.176557 (-0.036836) | 0.195705 / 0.737135 (-0.541430) | 0.150762 / 0.296338 (-0.145577) |

### 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) | 0.521306 / 0.215209 (0.306097) | 5.184982 / 2.077655 (3.107328) | 2.503979 / 1.504120 (0.999859) | 2.301054 / 1.541195 (0.759860) | 2.352713 / 1.468490 (0.884222) | 0.819804 / 4.584777 (-3.764973) | 4.584011 / 3.745712 (0.838299) | 2.497311 / 5.269862 (-2.772550) | 1.561262 / 4.565676 (-3.004414) | 0.101814 / 0.424275 (-0.322461) | 0.014078 / 0.007607 (0.006471) | 0.666564 / 0.226044 (0.440520) | 6.616379 / 2.268929 (4.347450) | 3.263892 / 55.444624 (-52.180732) | 2.891774 / 6.876477 (-3.984703) | 2.945260 / 2.142072 (0.803188) | 1.014379 / 4.805227 (-3.790848) | 0.201762 / 6.500664 (-6.298902) | 0.078012 / 0.075469 (0.002543) |

### 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) | 1.567808 / 1.841788 (-0.273980) | 19.096552 / 8.074308 (11.022244) | 15.522285 / 10.191392 (5.330893) | 0.226568 / 0.680424 (-0.453856) | 0.021078 / 0.534201 (-0.513123) | 0.501686 / 0.579283 (-0.077597) | 0.517575 / 0.434364 (0.083211) | 0.589685 / 0.540337 (0.049348) | 0.705053 / 1.386936 (-0.681883) |

</details>
</details>

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