minor fix for bfloat16


Comments:
The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_7003). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

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

PyArrow==8.0.0

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

### Benchmark: benchmark_array_xd.json

| metric | read_batch_formatted_as_numpy after write_array2d | read_batch_formatted_as_numpy after write_flattened_sequence | read_batch_formatted_as_numpy after write_nested_sequence | read_batch_unformated after write_array2d | read_batch_unformated after write_flattened_sequence | read_batch_unformated after write_nested_sequence | read_col_formatted_as_numpy after write_array2d | read_col_formatted_as_numpy after write_flattened_sequence | read_col_formatted_as_numpy after write_nested_sequence | read_col_unformated after write_array2d | read_col_unformated after write_flattened_sequence | read_col_unformated after write_nested_sequence | read_formatted_as_numpy after write_array2d | read_formatted_as_numpy after write_flattened_sequence | read_formatted_as_numpy after write_nested_sequence | read_unformated after write_array2d | read_unformated after write_flattened_sequence | read_unformated after write_nested_sequence | write_array2d | write_flattened_sequence | write_nested_sequence |
|--------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| new / old (diff) | 0.005633 / 0.011353 (-0.005720) | 0.004366 / 0.011008 (-0.006642) | 0.064081 / 0.038508 (0.025573) | 0.031790 / 0.023109 (0.008681) | 0.239270 / 0.275898 (-0.036628) | 0.267424 / 0.323480 (-0.056055) | 0.003229 / 0.007986 (-0.004756) | 0.002849 / 0.004328 (-0.001479) | 0.050147 / 0.004250 (0.045897) | 0.046119 / 0.037052 (0.009066) | 0.253506 / 0.258489 (-0.004983) | 0.280464 / 0.293841 (-0.013377) | 0.030561 / 0.128546 (-0.097985) | 0.012258 / 0.075646 (-0.063388) | 0.212222 / 0.419271 (-0.207049) | 0.036695 / 0.043533 (-0.006838) | 0.242141 / 0.255139 (-0.012998) | 0.263014 / 0.283200 (-0.020186) | 0.020008 / 0.141683 (-0.121675) | 1.103701 / 1.452155 (-0.348453) | 1.151641 / 1.492716 (-0.341076) |

### 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) | 0.095884 / 0.018006 (0.077878) | 0.300858 / 0.000490 (0.300368) | 0.000209 / 0.000200 (0.000009) | 0.000052 / 0.000054 (-0.000002) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.018713 / 0.037411 (-0.018698) | 0.063659 / 0.014526 (0.049134) | 0.074588 / 0.176557 (-0.101968) | 0.120779 / 0.737135 (-0.616356) | 0.077768 / 0.296338 (-0.218570) |

### 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) | 0.281680 / 0.215209 (0.066471) | 2.754658 / 2.077655 (0.677003) | 1.454036 / 1.504120 (-0.050084) | 1.333153 / 1.541195 (-0.208042) | 1.383616 / 1.468490 (-0.084874) | 0.728933 / 4.584777 (-3.855844) | 2.374989 / 3.745712 (-1.370723) | 2.990824 / 5.269862 (-2.279038) | 1.899065 / 4.565676 (-2.666612) | 0.078657 / 0.424275 (-0.345619) | 0.005162 / 0.007607 (-0.002445) | 0.335883 / 0.226044 (0.109838) | 3.323047 / 2.268929 (1.054119) | 1.848290 / 55.444624 (-53.596335) | 1.519510 / 6.876477 (-5.356966) | 1.563608 / 2.142072 (-0.578465) | 0.807890 / 4.805227 (-3.997337) | 0.134517 / 6.500664 (-6.366147) | 0.042208 / 0.075469 (-0.033262) |

### 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) | 0.963634 / 1.841788 (-0.878154) | 11.617868 / 8.074308 (3.543560) | 9.804648 / 10.191392 (-0.386744) | 0.142311 / 0.680424 (-0.538113) | 0.013748 / 0.534201 (-0.520453) | 0.300309 / 0.579283 (-0.278974) | 0.268214 / 0.434364 (-0.166150) | 0.342406 / 0.540337 (-0.197931) | 0.430315 / 1.386936 (-0.956621) |

</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) | 0.005533 / 0.011353 (-0.005820) | 0.004208 / 0.011008 (-0.006800) | 0.051732 / 0.038508 (0.013224) | 0.031296 / 0.023109 (0.008187) | 0.275091 / 0.275898 (-0.000807) | 0.296889 / 0.323480 (-0.026591) | 0.004363 / 0.007986 (-0.003623) | 0.002807 / 0.004328 (-0.001522) | 0.049727 / 0.004250 (0.045476) | 0.039798 / 0.037052 (0.002746) | 0.284379 / 0.258489 (0.025890) | 0.317281 / 0.293841 (0.023440) | 0.031286 / 0.128546 (-0.097261) | 0.012384 / 0.075646 (-0.063263) | 0.061619 / 0.419271 (-0.357652) | 0.032974 / 0.043533 (-0.010559) | 0.274313 / 0.255139 (0.019174) | 0.296142 / 0.283200 (0.012943) | 0.017391 / 0.141683 (-0.124291) | 1.148369 / 1.452155 (-0.303786) | 1.171539 / 1.492716 (-0.321177) |

### 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) | 0.097309 / 0.018006 (0.079302) | 0.304701 / 0.000490 (0.304212) | 0.000208 / 0.000200 (0.000008) | 0.000110 / 0.000054 (0.000055) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.022382 / 0.037411 (-0.015030) | 0.077000 / 0.014526 (0.062474) | 0.088165 / 0.176557 (-0.088392) | 0.129060 / 0.737135 (-0.608075) | 0.090128 / 0.296338 (-0.206211) |

### 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) | 0.285308 / 0.215209 (0.070099) | 2.816680 / 2.077655 (0.739025) | 1.542418 / 1.504120 (0.038298) | 1.418567 / 1.541195 (-0.122628) | 1.447018 / 1.468490 (-0.021472) | 0.737055 / 4.584777 (-3.847722) | 0.968285 / 3.745712 (-2.777427) | 2.880120 / 5.269862 (-2.389741) | 1.921813 / 4.565676 (-2.643864) | 0.079110 / 0.424275 (-0.345165) | 0.005826 / 0.007607 (-0.001781) | 0.336441 / 0.226044 (0.110397) | 3.326384 / 2.268929 (1.057456) | 1.929205 / 55.444624 (-53.515419) | 1.618215 / 6.876477 (-5.258261) | 1.769688 / 2.142072 (-0.372385) | 0.808009 / 4.805227 (-3.997219) | 0.136384 / 6.500664 (-6.364280) | 0.041332 / 0.075469 (-0.034137) |

### 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) | 1.010884 / 1.841788 (-0.830903) | 12.266118 / 8.074308 (4.191810) | 10.287424 / 10.191392 (0.096032) | 0.143172 / 0.680424 (-0.537251) | 0.015798 / 0.534201 (-0.518403) | 0.301604 / 0.579283 (-0.277679) | 0.131079 / 0.434364 (-0.303285) | 0.338396 / 0.540337 (-0.201941) | 0.460721 / 1.386936 (-0.926215) |

</details>
</details>

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