Title: Deprecate Pandas builder
State: closed

The Pandas packaged builder is undocumented and relies on `pickle` to read the data, making it **unsafe**. Moreover, I haven't seen a single instance of this builder being used (not even using the GH/Hub search), so we should deprecate it.

Comments:
The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_6730). 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) | 0.005301 / 0.011353 (-0.006052) | 0.003701 / 0.011008 (-0.007307) | 0.065830 / 0.038508 (0.027322) | 0.029791 / 0.023109 (0.006682) | 0.251676 / 0.275898 (-0.024222) | 0.283824 / 0.323480 (-0.039655) | 0.003083 / 0.007986 (-0.004903) | 0.004144 / 0.004328 (-0.000185) | 0.053670 / 0.004250 (0.049419) | 0.042020 / 0.037052 (0.004968) | 0.266389 / 0.258489 (0.007899) | 0.296740 / 0.293841 (0.002900) | 0.028320 / 0.128546 (-0.100226) | 0.010604 / 0.075646 (-0.065042) | 0.219881 / 0.419271 (-0.199390) | 0.036216 / 0.043533 (-0.007317) | 0.255718 / 0.255139 (0.000579) | 0.275808 / 0.283200 (-0.007392) | 0.018407 / 0.141683 (-0.123276) | 1.140007 / 1.452155 (-0.312148) | 1.174005 / 1.492716 (-0.318711) |

### 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) | 0.091230 / 0.018006 (0.073224) | 0.300704 / 0.000490 (0.300215) | 0.000207 / 0.000200 (0.000007) | 0.000043 / 0.000054 (-0.000011) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.018950 / 0.037411 (-0.018461) | 0.062177 / 0.014526 (0.047651) | 0.073968 / 0.176557 (-0.102589) | 0.122161 / 0.737135 (-0.614974) | 0.075001 / 0.296338 (-0.221338) |

### 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) | 0.285675 / 0.215209 (0.070466) | 2.794176 / 2.077655 (0.716522) | 1.478666 / 1.504120 (-0.025454) | 1.361843 / 1.541195 (-0.179351) | 1.383847 / 1.468490 (-0.084643) | 0.568610 / 4.584777 (-4.016167) | 2.402351 / 3.745712 (-1.343361) | 2.860772 / 5.269862 (-2.409089) | 1.768588 / 4.565676 (-2.797089) | 0.063257 / 0.424275 (-0.361018) | 0.004998 / 0.007607 (-0.002609) | 0.340897 / 0.226044 (0.114853) | 3.340238 / 2.268929 (1.071310) | 1.836434 / 55.444624 (-53.608190) | 1.556844 / 6.876477 (-5.319633) | 1.610685 / 2.142072 (-0.531388) | 0.644941 / 4.805227 (-4.160286) | 0.117593 / 6.500664 (-6.383072) | 0.042803 / 0.075469 (-0.032666) |

### 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) | 0.979181 / 1.841788 (-0.862607) | 11.901365 / 8.074308 (3.827057) | 9.587943 / 10.191392 (-0.603449) | 0.139648 / 0.680424 (-0.540776) | 0.013904 / 0.534201 (-0.520297) | 0.291249 / 0.579283 (-0.288034) | 0.260737 / 0.434364 (-0.173627) | 0.326000 / 0.540337 (-0.214338) | 0.433459 / 1.386936 (-0.953477) |

</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) | 0.005503 / 0.011353 (-0.005850) | 0.003738 / 0.011008 (-0.007270) | 0.049137 / 0.038508 (0.010629) | 0.031484 / 0.023109 (0.008374) | 0.265783 / 0.275898 (-0.010115) | 0.295125 / 0.323480 (-0.028354) | 0.004074 / 0.007986 (-0.003911) | 0.002707 / 0.004328 (-0.001622) | 0.048340 / 0.004250 (0.044089) | 0.045453 / 0.037052 (0.008401) | 0.276500 / 0.258489 (0.018011) | 0.312002 / 0.293841 (0.018162) | 0.029139 / 0.128546 (-0.099408) | 0.010445 / 0.075646 (-0.065201) | 0.057486 / 0.419271 (-0.361785) | 0.052386 / 0.043533 (0.008853) | 0.267099 / 0.255139 (0.011960) | 0.283193 / 0.283200 (-0.000007) | 0.018368 / 0.141683 (-0.123315) | 1.136207 / 1.452155 (-0.315948) | 1.178418 / 1.492716 (-0.314298) |

### 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) | 0.089270 / 0.018006 (0.071264) | 0.301087 / 0.000490 (0.300598) | 0.000208 / 0.000200 (0.000008) | 0.000050 / 0.000054 (-0.000005) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.021991 / 0.037411 (-0.015421) | 0.075357 / 0.014526 (0.060831) | 0.087781 / 0.176557 (-0.088775) | 0.126923 / 0.737135 (-0.610212) | 0.088491 / 0.296338 (-0.207847) |

### 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) | 0.293653 / 0.215209 (0.078444) | 2.872156 / 2.077655 (0.794501) | 1.559229 / 1.504120 (0.055109) | 1.441201 / 1.541195 (-0.099993) | 1.472642 / 1.468490 (0.004152) | 0.588463 / 4.584777 (-3.996314) | 2.447685 / 3.745712 (-1.298028) | 2.755752 / 5.269862 (-2.514110) | 1.796591 / 4.565676 (-2.769086) | 0.068024 / 0.424275 (-0.356252) | 0.005148 / 0.007607 (-0.002459) | 0.343572 / 0.226044 (0.117528) | 3.347856 / 2.268929 (1.078927) | 1.945977 / 55.444624 (-53.498647) | 1.648953 / 6.876477 (-5.227524) | 1.804468 / 2.142072 (-0.337604) | 0.651034 / 4.805227 (-4.154193) | 0.118130 / 6.500664 (-6.382534) | 0.041019 / 0.075469 (-0.034450) |

### 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) | 1.020461 / 1.841788 (-0.821327) | 12.514237 / 8.074308 (4.439929) | 10.696276 / 10.191392 (0.504884) | 0.154549 / 0.680424 (-0.525874) | 0.015964 / 0.534201 (-0.518237) | 0.290392 / 0.579283 (-0.288891) | 0.276074 / 0.434364 (-0.158290) | 0.326253 / 0.540337 (-0.214085) | 0.440383 / 1.386936 (-0.946553) |

</details>
</details>

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