Title: Validate name parameter in make_file_instructions
State: closed

Validate `name` parameter in `make_file_instructions`.

This way users get more informative error messages, instead of:
```stacktrace
.../huggingface/datasets/src/datasets/arrow_reader.py in make_file_instructions(name, split_infos, instruction, filetype_suffix, prefix_path)
    110     name2len = {info.name: info.num_examples for info in split_infos}
    111     name2shard_lengths = {info.name: info.shard_lengths for info in split_infos}
--> 112     name2filenames = {
    113         info.name: filenames_for_dataset_split(
    114             path=prefix_path,

.../huggingface/datasets/src/datasets/arrow_reader.py in <dictcomp>(.0)
    111     name2shard_lengths = {info.name: info.shard_lengths for info in split_infos}
    112     name2filenames = {
--> 113         info.name: filenames_for_dataset_split(
    114             path=prefix_path,
    115             dataset_name=name,

.../huggingface/datasets/src/datasets/naming.py in filenames_for_dataset_split(path, dataset_name, split, filetype_suffix, shard_lengths)
     68 
     69 def filenames_for_dataset_split(path, dataset_name, split, filetype_suffix=None, shard_lengths=None):
---> 70     prefix = filename_prefix_for_split(dataset_name, split)
     71     prefix = os.path.join(path, prefix)
     72 

.../huggingface/datasets/src/datasets/naming.py in filename_prefix_for_split(name, split)
     52 
     53 def filename_prefix_for_split(name, split):
---> 54     if os.path.basename(name) != name:
     55         raise ValueError(f"Should be a dataset name, not a path: {name}")
     56     if not re.match(_split_re, split):

.../lib/python3.9/posixpath.py in basename(p)
    140 def basename(p):
    141     """Returns the final component of a pathname"""
--> 142     p = os.fspath(p)
    143     sep = _get_sep(p)
    144     i = p.rfind(sep) + 1

TypeError: expected str, bytes or os.PathLike object, not NoneType
```

Related to #5895.

Comments:
_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) | 0.007401 / 0.011353 (-0.003952) | 0.005198 / 0.011008 (-0.005810) | 0.112317 / 0.038508 (0.073809) | 0.038406 / 0.023109 (0.015297) | 0.358008 / 0.275898 (0.082110) | 0.395350 / 0.323480 (0.071870) | 0.006201 / 0.007986 (-0.001785) | 0.004368 / 0.004328 (0.000039) | 0.087718 / 0.004250 (0.083467) | 0.055299 / 0.037052 (0.018247) | 0.350481 / 0.258489 (0.091992) | 0.419876 / 0.293841 (0.126035) | 0.032459 / 0.128546 (-0.096087) | 0.010635 / 0.075646 (-0.065011) | 0.383282 / 0.419271 (-0.035989) | 0.059241 / 0.043533 (0.015708) | 0.365101 / 0.255139 (0.109962) | 0.378144 / 0.283200 (0.094944) | 0.114287 / 0.141683 (-0.027396) | 1.680870 / 1.452155 (0.228715) | 1.788183 / 1.492716 (0.295467) |

### 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) | 0.242919 / 0.018006 (0.224913) | 0.489850 / 0.000490 (0.489360) | 0.011408 / 0.000200 (0.011208) | 0.000444 / 0.000054 (0.000389) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.030742 / 0.037411 (-0.006669) | 0.123092 / 0.014526 (0.108566) | 0.138246 / 0.176557 (-0.038311) | 0.207299 / 0.737135 (-0.529836) | 0.142647 / 0.296338 (-0.153691) |

### 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) | 0.472553 / 0.215209 (0.257344) | 4.671763 / 2.077655 (2.594108) | 2.119986 / 1.504120 (0.615866) | 1.891851 / 1.541195 (0.350656) | 1.979094 / 1.468490 (0.510604) | 0.617956 / 4.584777 (-3.966821) | 4.969418 / 3.745712 (1.223706) | 4.672083 / 5.269862 (-0.597779) | 2.119049 / 4.565676 (-2.446627) | 0.077466 / 0.424275 (-0.346809) | 0.014434 / 0.007607 (0.006827) | 0.580746 / 0.226044 (0.354701) | 5.805458 / 2.268929 (3.536530) | 2.622498 / 55.444624 (-52.822126) | 2.259499 / 6.876477 (-4.616978) | 2.362078 / 2.142072 (0.220006) | 0.719911 / 4.805227 (-4.085317) | 0.164939 / 6.500664 (-6.335725) | 0.074762 / 0.075469 (-0.000707) |

### 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) | 1.496709 / 1.841788 (-0.345079) | 18.247499 / 8.074308 (10.173191) | 15.397075 / 10.191392 (5.205683) | 0.181163 / 0.680424 (-0.499261) | 0.022604 / 0.534201 (-0.511597) | 0.462791 / 0.579283 (-0.116492) | 0.504473 / 0.434364 (0.070109) | 0.582254 / 0.540337 (0.041917) | 0.673849 / 1.386936 (-0.713087) |

</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) | 0.007633 / 0.011353 (-0.003720) | 0.004859 / 0.011008 (-0.006149) | 0.091194 / 0.038508 (0.052686) | 0.038255 / 0.023109 (0.015146) | 0.460972 / 0.275898 (0.185074) | 0.470441 / 0.323480 (0.146961) | 0.006482 / 0.007986 (-0.001504) | 0.004500 / 0.004328 (0.000172) | 0.089998 / 0.004250 (0.085748) | 0.055470 / 0.037052 (0.018418) | 0.459188 / 0.258489 (0.200699) | 0.491255 / 0.293841 (0.197414) | 0.032200 / 0.128546 (-0.096346) | 0.010372 / 0.075646 (-0.065274) | 0.097429 / 0.419271 (-0.321843) | 0.052469 / 0.043533 (0.008936) | 0.452492 / 0.255139 (0.197353) | 0.475210 / 0.283200 (0.192010) | 0.116976 / 0.141683 (-0.024707) | 1.752742 / 1.452155 (0.300587) | 1.849535 / 1.492716 (0.356819) |

### 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) | 0.229822 / 0.018006 (0.211816) | 0.472259 / 0.000490 (0.471770) | 0.000455 / 0.000200 (0.000255) | 0.000067 / 0.000054 (0.000013) |

### Benchmark: benchmark_indices_mapping.json

| metric | select | shard | shuffle | sort | train_test_split |
|--------|---|---|---|---|---|
| new / old (diff) | 0.033796 / 0.037411 (-0.003615) | 0.136151 / 0.014526 (0.121625) | 0.144015 / 0.176557 (-0.032542) | 0.199337 / 0.737135 (-0.537798) | 0.150024 / 0.296338 (-0.146315) |

### 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) | 0.522737 / 0.215209 (0.307528) | 5.165223 / 2.077655 (3.087568) | 2.630334 / 1.504120 (1.126214) | 2.392383 / 1.541195 (0.851188) | 2.488966 / 1.468490 (1.020476) | 0.608981 / 4.584777 (-3.975796) | 4.711545 / 3.745712 (0.965833) | 2.121537 / 5.269862 (-3.148325) | 1.205477 / 4.565676 (-3.360199) | 0.078277 / 0.424275 (-0.345998) | 0.014175 / 0.007607 (0.006568) | 0.640720 / 0.226044 (0.414675) | 6.391173 / 2.268929 (4.122245) | 3.265131 / 55.444624 (-52.179493) | 2.939188 / 6.876477 (-3.937289) | 2.919217 / 2.142072 (0.777145) | 0.745095 / 4.805227 (-4.060132) | 0.164065 / 6.500664 (-6.336599) | 0.076993 / 0.075469 (0.001524) |

### 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) | 1.539971 / 1.841788 (-0.301817) | 18.597296 / 8.074308 (10.522988) | 16.899330 / 10.191392 (6.707938) | 0.169005 / 0.680424 (-0.511419) | 0.020447 / 0.534201 (-0.513754) | 0.465862 / 0.579283 (-0.113421) | 0.522819 / 0.434364 (0.088455) | 0.547111 / 0.540337 (0.006773) | 0.657777 / 1.386936 (-0.729159) |

</details>
</details>

![](https://cml.dev/watermark.png#56aff9ecb4e565eb95faad525558914648cc22f1 "CML watermark")