Set dev version


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<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) | 0.005301 / 0.011353 (-0.006052) | 0.003633 / 0.011008 (-0.007375) | 0.063414 / 0.038508 (0.024906) | 0.042406 / 0.023109 (0.019297) | 0.253414 / 0.275898 (-0.022484) | 0.276811 / 0.323480 (-0.046668) | 0.003148 / 0.007986 (-0.004837) | 0.002614 / 0.004328 (-0.001715) | 0.049208 / 0.004250 (0.044958) | 0.045819 / 0.037052 (0.008767) | 0.268027 / 0.258489 (0.009538) | 0.298821 / 0.293841 (0.004980) | 0.028460 / 0.128546 (-0.100086) | 0.010671 / 0.075646 (-0.064975) | 0.208602 / 0.419271 (-0.210669) | 0.036057 / 0.043533 (-0.007476) | 0.256079 / 0.255139 (0.000940) | 0.277040 / 0.283200 (-0.006160) | 0.019018 / 0.141683 (-0.122665) | 1.147070 / 1.452155 (-0.305085) | 1.175838 / 1.492716 (-0.316878) |

### 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) | 0.092216 / 0.018006 (0.074210) | 0.304774 / 0.000490 (0.304284) | 0.000212 / 0.000200 (0.000012) | 0.000044 / 0.000054 (-0.000010) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.018242 / 0.037411 (-0.019170) | 0.061088 / 0.014526 (0.046562) | 0.074517 / 0.176557 (-0.102039) | 0.120444 / 0.737135 (-0.616691) | 0.074628 / 0.296338 (-0.221710) |

### 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) | 0.283914 / 0.215209 (0.068705) | 2.859123 / 2.077655 (0.781469) | 1.495152 / 1.504120 (-0.008967) | 1.395514 / 1.541195 (-0.145681) | 1.454076 / 1.468490 (-0.014414) | 0.568758 / 4.584777 (-4.016019) | 2.461304 / 3.745712 (-1.284408) | 2.836192 / 5.269862 (-2.433670) | 1.815463 / 4.565676 (-2.750213) | 0.065762 / 0.424275 (-0.358513) | 0.006872 / 0.007607 (-0.000736) | 0.339304 / 0.226044 (0.113260) | 3.326544 / 2.268929 (1.057616) | 1.847970 / 55.444624 (-53.596654) | 1.572667 / 6.876477 (-5.303809) | 1.595717 / 2.142072 (-0.546355) | 0.644196 / 4.805227 (-4.161031) | 0.120320 / 6.500664 (-6.380344) | 0.043334 / 0.075469 (-0.032135) |

### 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) | 0.965807 / 1.841788 (-0.875981) | 11.628715 / 8.074308 (3.554406) | 9.485618 / 10.191392 (-0.705774) | 0.152387 / 0.680424 (-0.528037) | 0.013852 / 0.534201 (-0.520349) | 0.285833 / 0.579283 (-0.293450) | 0.263692 / 0.434364 (-0.170672) | 0.323086 / 0.540337 (-0.217251) | 0.418178 / 1.386936 (-0.968758) |

</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) | 0.005505 / 0.011353 (-0.005848) | 0.003630 / 0.011008 (-0.007378) | 0.049780 / 0.038508 (0.011272) | 0.030469 / 0.023109 (0.007359) | 0.270052 / 0.275898 (-0.005846) | 0.294370 / 0.323480 (-0.029110) | 0.004207 / 0.007986 (-0.003779) | 0.002720 / 0.004328 (-0.001609) | 0.048952 / 0.004250 (0.044701) | 0.041006 / 0.037052 (0.003953) | 0.281585 / 0.258489 (0.023096) | 0.310600 / 0.293841 (0.016759) | 0.029457 / 0.128546 (-0.099089) | 0.010508 / 0.075646 (-0.065138) | 0.058090 / 0.419271 (-0.361181) | 0.032814 / 0.043533 (-0.010718) | 0.272755 / 0.255139 (0.017616) | 0.292154 / 0.283200 (0.008954) | 0.018312 / 0.141683 (-0.123371) | 1.177199 / 1.452155 (-0.274955) | 1.238803 / 1.492716 (-0.253913) |

### 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) | 0.093889 / 0.018006 (0.075883) | 0.303054 / 0.000490 (0.302564) | 0.000204 / 0.000200 (0.000004) | 0.000044 / 0.000054 (-0.000011) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.022556 / 0.037411 (-0.014856) | 0.075951 / 0.014526 (0.061425) | 0.086824 / 0.176557 (-0.089732) | 0.128091 / 0.737135 (-0.609044) | 0.088146 / 0.296338 (-0.208192) |

### 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) | 0.292563 / 0.215209 (0.077354) | 2.882656 / 2.077655 (0.805001) | 1.559814 / 1.504120 (0.055695) | 1.443760 / 1.541195 (-0.097435) | 1.460967 / 1.468490 (-0.007523) | 0.567812 / 4.584777 (-4.016965) | 0.964407 / 3.745712 (-2.781305) | 2.819782 / 5.269862 (-2.450079) | 1.733334 / 4.565676 (-2.832343) | 0.064745 / 0.424275 (-0.359530) | 0.005178 / 0.007607 (-0.002429) | 0.345322 / 0.226044 (0.119278) | 3.407204 / 2.268929 (1.138275) | 1.919337 / 55.444624 (-53.525288) | 1.643463 / 6.876477 (-5.233013) | 1.682191 / 2.142072 (-0.459881) | 0.639432 / 4.805227 (-4.165795) | 0.115659 / 6.500664 (-6.385005) | 0.041202 / 0.075469 (-0.034267) |

### 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) | 1.004664 / 1.841788 (-0.837123) | 12.043460 / 8.074308 (3.969152) | 9.856431 / 10.191392 (-0.334961) | 0.131351 / 0.680424 (-0.549072) | 0.015800 / 0.534201 (-0.518401) | 0.288211 / 0.579283 (-0.291072) | 0.126065 / 0.434364 (-0.308298) | 0.386494 / 0.540337 (-0.153843) | 0.424203 / 1.386936 (-0.962733) |

</details>
</details>

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