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# Pipelines
ใใคใใฉใคใณใฏใๆจ่ซใซใขใใซใไฝฟใใใใฎ็ฐกๅใงๅชใใๆนๆณใงใใใใใคใใฉใคใณใฏใ่ค้ใชใณใผใใฎใปใจใใฉใๆฝ่ฑกๅใใใชใใธใงใฏใใงใใ
ใใคใใฉใคใณใฏใใฉใคใใฉใชใใ่ค้ใชใณใผใใฎใปใจใใฉใๆฝ่ฑกๅใใใชใใธใงใฏใใงใๅๅไปใๅบๆ่กจ็พ่ช่ญใใในใฏ่จ่ชใขใใชใณใฐใๆๆ
ๅๆใ็นๅพดๆฝๅบใ่ณชๅๅฟ็ญใชใฉใฎใฟในใฏใซ็นๅใใใทใณใใซใชAPIใๆไพใใพใใ
RecognitionใMasked Language ModelingใSentiment AnalysisใFeature ExtractionใQuestion Answeringใชใฉใฎใฟในใฏใซ็นๅใใใทใณใใซใชAPIใๆไพใใพใใไปฅไธใๅ็
งใฎใใจใ
[ใฟในใฏๆฆ่ฆ](../task_summary)ใๅ็
งใใฆใใ ใใใ
ใใคใใฉใคใณใฎๆฝ่ฑกๅใซใฏ2ใคใฎใซใใดใชใผใใใ๏ผ
- [`pipeline`] ใฏใไปใฎใในใฆใฎใใคใใฉใคใณใใซใใปใซๅใใๆใๅผทๅใชใชใใธใงใฏใใงใใ
- ใฟในใฏๅบๆใฎใใคใใฉใคใณใฏใ[ใชใผใใฃใช](#audio)ใ[ใณใณใใฅใผใฟใผ ใใธใงใณ](#computer-vision)ใ[่ช็ถ่จ่ชๅฆ็](#natural-language-processing)ใใใใณ [ใใซใใขใผใใซ](#multimodal) ใฟในใฏใงไฝฟ็จใงใใพใใ
## The pipeline abstraction
*ใใคใใฉใคใณ* ๆฝ่ฑกๅใฏใไปใฎใในใฆใฎๅฉ็จๅฏ่ฝใชใใคใใฉใคใณใฎใฉใใใผใงใใไปใฎใใฎใจๅๆงใซใคใณในใฟใณในๅใใใพใ
ใใคใใฉใคใณใงใใใใใใชใ็ๆดปใฎ่ณชใๆไพใงใใพใใ
1 ใคใฎ้
็ฎใซๅฏพใใๅ็ดใชๅผใณๅบใ:
```python
>>> pipe = pipeline("text-classification")
>>> pipe("This restaurant is awesome")
[{'label': 'POSITIVE', 'score': 0.9998743534088135}]
```
[ใใ](https://huggingface.co) ใฎ็นๅฎใฎใขใใซใไฝฟ็จใใใๅ ดๅใฏใใขใใซใใชใณใซใชใฃใฆใใๅ ดๅใฏใฟในใฏใ็ก่ฆใงใใพใใ
ใใใฏใใงใซใใใๅฎ็พฉใใฆใใพใใ
```python
>>> pipe = pipeline(model="FacebookAI/roberta-large-mnli")
>>> pipe("This restaurant is awesome")
[{'label': 'NEUTRAL', 'score': 0.7313136458396912}]
```
ๅคใใฎ้
็ฎใซๅฏพใใฆใใคใใฉใคใณใๅผใณๅบใใซใฏใ*list* ใไฝฟ็จใใฆใใคใใฉใคใณใๅผใณๅบใใใจใใงใใพใใ
```python
>>> pipe = pipeline("text-classification")
>>> pipe(["This restaurant is awesome", "This restaurant is awful"])
[{'label': 'POSITIVE', 'score': 0.9998743534088135},
{'label': 'NEGATIVE', 'score': 0.9996669292449951}]
```
ๅฎๅ
จใชใใผใฟใปใใใๅๅพฉใใใซใฏใ`Dataset`ใ็ดๆฅไฝฟ็จใใใใจใใๅงใใใพใใใใใฏใๅฒใๅฝใฆใๅฟ
่ฆใใชใใใจใๆๅณใใพใ
ใใผใฟใปใใๅ
จไฝใไธๅบฆใซๅฆ็ใใใใจใใ่ชๅใงใใใๅฆ็ใ่กใๅฟ
่ฆใใใใพใใใใใใฏใซในใฟใ ใซใผใใจๅใใใใ้ใๅไฝใใใฏใใงใใ
GPUใใใใๅ้กใงใชใๅ ดๅใฏใใใใใใใซๅ้กใไฝๆใใฆใใ ใใใ
```python
import datasets
from transformers import pipeline
from transformers.pipelines.pt_utils import KeyDataset
from tqdm.auto import tqdm
pipe = pipeline("automatic-speech-recognition", model="facebook/wav2vec2-base-960h", device=0)
dataset = datasets.load_dataset("superb", name="asr", split="test")
# KeyDataset (only *pt*) will simply return the item in the dict returned by the dataset item
# as we're not interested in the *target* part of the dataset. For sentence pair use KeyPairDataset
for out in tqdm(pipe(KeyDataset(dataset, "file"))):
print(out)
# {"text": "NUMBER TEN FRESH NELLY IS WAITING ON YOU GOOD NIGHT HUSBAND"}
# {"text": ....}
# ....
```
ไฝฟใใใใใใใใใซใใธใงใใฌใผใฟใผใไฝฟ็จใใใใจใใงใใพใใ
```python
from transformers import pipeline
pipe = pipeline("text-classification")
def data():
while True:
# This could come from a dataset, a database, a queue or HTTP request
# in a server
# Caveat: because this is iterative, you cannot use `num_workers > 1` variable
# to use multiple threads to preprocess data. You can still have 1 thread that
# does the preprocessing while the main runs the big inference
yield "This is a test"
for out in pipe(data()):
print(out)
# {"text": "NUMBER TEN FRESH NELLY IS WAITING ON YOU GOOD NIGHT HUSBAND"}
# {"text": ....}
# ....
```
[[autodoc]] pipeline
## Pipeline batching
ใในใฆใฎใใคใใฉใคใณใงใใใๅฆ็ใไฝฟ็จใงใใพใใใใใฏใใพใใใใพใ
ใใคใใฉใคใณใในใใชใผใใณใฐๆฉ่ฝใไฝฟ็จใใใจใใฏๅธธใซ (ใคใพใใใชในใใ`dataset`ใใพใใฏ `generator`ใๆธกใใจใ)ใ
```python
from transformers import pipeline
from transformers.pipelines.pt_utils import KeyDataset
import datasets
dataset = datasets.load_dataset("imdb", name="plain_text", split="unsupervised")
pipe = pipeline("text-classification", device=0)
for out in pipe(KeyDataset(dataset, "text"), batch_size=8, truncation="only_first"):
print(out)
# [{'label': 'POSITIVE', 'score': 0.9998743534088135}]
# Exactly the same output as before, but the content are passed
# as batches to the model
```
<Tip warning={true}>
ใใ ใใใใใซใใฃใฆใใใฉใผใใณในใ่ชๅ็ใซๅไธใใใใใงใฏใใใพใใใ็ถๆณใซๅฟใใฆใ10 ๅใฎ้ซ้ๅใพใใฏ 5 ๅใฎไฝ้ๅใฎใใใใใซใชใใพใใ
ใใผใใฆใงใขใใใผใฟใไฝฟ็จใใใฆใใๅฎ้ใฎใขใใซใซใคใใฆใ
ไธปใซ้ซ้ๅใงใใไพ:
</Tip>
```python
from transformers import pipeline
from torch.utils.data import Dataset
from tqdm.auto import tqdm
pipe = pipeline("text-classification", device=0)
class MyDataset(Dataset):
def __len__(self):
return 5000
def __getitem__(self, i):
return "This is a test"
dataset = MyDataset()
for batch_size in [1, 8, 64, 256]:
print("-" * 30)
print(f"Streaming batch_size={batch_size}")
for out in tqdm(pipe(dataset, batch_size=batch_size), total=len(dataset)):
pass
```
```
# On GTX 970
------------------------------
Streaming no batching
100%|โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโ| 5000/5000 [00:26<00:00, 187.52it/s]
------------------------------
Streaming batch_size=8
100%|โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโ| 5000/5000 [00:04<00:00, 1205.95it/s]
------------------------------
Streaming batch_size=64
100%|โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโ| 5000/5000 [00:02<00:00, 2478.24it/s]
------------------------------
Streaming batch_size=256
100%|โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโ| 5000/5000 [00:01<00:00, 2554.43it/s]
(diminishing returns, saturated the GPU)
```
ๆใ้ๅบฆใไฝไธใใไพ:
```python
class MyDataset(Dataset):
def __len__(self):
return 5000
def __getitem__(self, i):
if i % 64 == 0:
n = 100
else:
n = 1
return "This is a test" * n
```
ใใใฏใไปใฎๆใซๆฏในใฆ้ๅธธใซ้ทใๆใๆๆใใใพใใใใฎๅ ดๅใ**ๅ
จไฝ**ใฎใใใใฏ 400 ใงใใๅฟ
่ฆใใใใพใใ
ใใผใฏใณใ้ทใใใใใใใๅ
จไฝใ [64, 4] ใงใฏใชใ [64, 400] ใซใชใใ้ๅบฆใๅคงๅน
ใซไฝไธใใพใใใใใซๆชใใใจใซใ
ใใใใๅคงใใใชใใจใใใญใฐใฉใ ใฏๅ็ดใซใฏใฉใใทใฅใใพใใ
```
------------------------------
Streaming no batching
100%|โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโ| 1000/1000 [00:05<00:00, 183.69it/s]
------------------------------
Streaming batch_size=8
100%|โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโ| 1000/1000 [00:03<00:00, 265.74it/s]
------------------------------
Streaming batch_size=64
100%|โโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโ| 1000/1000 [00:26<00:00, 37.80it/s]
------------------------------
Streaming batch_size=256
0%| | 0/1000 [00:00<?, ?it/s]
Traceback (most recent call last):
File "/home/nicolas/src/transformers/test.py", line 42, in <module>
for out in tqdm(pipe(dataset, batch_size=256), total=len(dataset)):
....
q = q / math.sqrt(dim_per_head) # (bs, n_heads, q_length, dim_per_head)
RuntimeError: CUDA out of memory. Tried to allocate 376.00 MiB (GPU 0; 3.95 GiB total capacity; 1.72 GiB already allocated; 354.88 MiB free; 2.46 GiB reserved in total by PyTorch)
```
ใใฎๅ้กใซๅฏพใใ้ฉๅใช (ไธ่ฌ็ใช) ่งฃๆฑบ็ญใฏใชใใไฝฟ็จใงใใ่ท้ขใฏใฆใผในใฑใผในใซใใฃใฆ็ฐใชใๅ ดๅใใใใพใใใฎใซใผใซ
่ฆชๆ๏ผ
ใฆใผใถใผใซใจใฃใฆใฎ็ต้จๅใฏๆฌกใฎใจใใใงใใ
- **ใใผใใฆใงใขใไฝฟ็จใใฆใ่ฒ ่ทใซๅฏพใใใใใฉใผใใณในใๆธฌๅฎใใพใใๆธฌใฃใฆใๆธฌใฃใฆใๆธฌใ็ถใใใๅฎๆฐใจใใใฎใฏใ
้ฒใในใๅฏไธใฎๆนๆณใ**
- ใฌใคใใณใทใซๅถ็ดใใใๅ ดๅ (ๅฎ้ใฎ่ฃฝๅใๆจ่ซใๅฎ่กใใฆใใๅ ดๅ)ใใใใๅฆ็ใ่กใใชใใงใใ ใใใ
- CPU ใไฝฟ็จใใฆใใๅ ดๅใฏใใใใๅฆ็ใ่กใใชใใงใใ ใใใ
- GPU ใงในใซใผใใใใไฝฟ็จใใฆใใๅ ดๅ (ๅคง้ใฎ้็ใใผใฟใงใขใใซใๅฎ่กใใใๅ ดๅ)ใๆฌกใฎใใใซใใพใใ
- sequence_length (ใ่ช็ถใชใใใผใฟ) ใฎใตใคใบใซใคใใฆใพใฃใใใใใใชใๅ ดๅใฏใใใใฉใซใใงใฏใใใๅฆ็ใๆธฌๅฎใ่กใใใ
ๆซๅฎ็ใซ่ฟฝๅ ใใฆใฟใพใใๅคฑๆใใๅ ดๅใซๅๅพฉใใใใใซ OOM ใใงใใฏใ่ฟฝๅ ใใพใ (ๅคฑๆใใๅ ดๅใฏใใใๆ็นใงๅๅพฉใใพใ)ใ
sequence_length ใๅถๅพกใใพใใ)
- sequence_length ใ้ๅธธใซ่ฆๅ็ใงใใๅ ดๅใใใใๅฆ็ใฏ้ๅธธใซ่ๅณๆทฑใใใฎใจใชใๅฏ่ฝๆงใ้ซใใๆธฌๅฎใใฆใใใทใฅใใฆใใ ใใใ
OOM ใ็บ็ใใใพใง็ถใใพใใ
- GPU ใๅคงใใใปใฉใใใใๅฆ็ใใใ่ๅณๆทฑใใใฎใซใชใๅฏ่ฝๆงใ้ซใใชใใพใใ
- ใใใๅฆ็ใๆๅนใซใใใใใใซใOOM ใ้ฉๅใซๅฆ็ใงใใใใจใ็ขบ่ชใใฆใใ ใใใ
## Pipeline chunk batching
`zero-shot-classification` ใจ `question-answering` ใฏใๅไธใฎๅ
ฅๅใง็ตๆใๅพใใใๅฏ่ฝๆงใใใใจใใๆๅณใงใๅฐใ็นๆฎใงใใ
ใขใใซใฎ่คๆฐใฎๅๆนใในใ้ๅธธใฎ็ถๆณใงใฏใใใใซใใ `batch_size` ๅผๆฐใซ้ขใใๅ้กใ็บ็ใใพใใ
ใใฎๅ้กใๅ้ฟใใใใใซใใใใใฎใใคใใฉใคใณใฏใฉใกใใๅฐใ็นๆฎใซใชใฃใฆใใใไปฃใใใซ `ChunkPipeline` ใซใชใฃใฆใใพใใ
้ๅธธใฎ `Pipeline`ใ่ฆใใใซ๏ผ
```python
preprocessed = pipe.preprocess(inputs)
model_outputs = pipe.forward(preprocessed)
outputs = pipe.postprocess(model_outputs)
```
ไปใฏๆฌกใฎใใใซใชใใพใ:
```python
all_model_outputs = []
for preprocessed in pipe.preprocess(inputs):
model_outputs = pipe.forward(preprocessed)
all_model_outputs.append(model_outputs)
outputs = pipe.postprocess(all_model_outputs)
```
ใใคใใฉใคใณใฏไปฅไธใงไฝฟ็จใใใใใใใใใฏใณใผใใซๅฏพใใฆ้ๅธธใซ้้็ใงใใๅฟ
่ฆใใใใพใใ
ๅใๆนๆณใ
ใใคใใฉใคใณใฏใใใใ่ชๅ็ใซๅฆ็ใงใใใใใใใใฏ็ฐก็ฅๅใใใใใฅใผใงใใๆฐใซใใๅฟ
่ฆใฏใชใใจใใๆๅณใงใ
ๅ
ฅๅใๅฎ้ใซใใชใฌใผใใๅๆนใในใฎๆฐใซใคใใฆใฏใ`batch_size` ใๆ้ฉๅใงใใพใใ
ๅ
ฅๅใจใฏ็ฌ็ซใใฆใๅใฎใปใฏใทใงใณใฎๆณจๆไบ้
ใๅผใ็ถใ้ฉ็จใใใพใใ
## Pipeline custom code
็นๅฎใฎใใคใใฉใคใณใใชใผใใผใฉใคใใใๅ ดๅใ
็ฎใฎๅใฎใฟในใฏใซ้ขใใๅ้กใไฝๆใใใใจใ่บ่บใใชใใงใใ ใใใใใคใใฉใคใณใฎ็ฎๆจใฏใไฝฟใใใใใใปใจใใฉใฎใฆใผใถใผใใตใใผใใใใใจใงใใ
ใใใใฃใฆใ`transformers`ใใใชใใฎใฆใผในใฑใผในใใตใใผใใใๅฏ่ฝๆงใใใใพใใ
ๅ็ดใซ่ฉฆใใฆใฟใใๅ ดๅใฏใๆฌกใฎใใจใใงใใพใใ
- ้ธๆใใใใคใใฉใคใณใใตใใฏใฉในๅใใพใ
```python
class MyPipeline(TextClassificationPipeline):
def postprocess():
# Your code goes here
scores = scores * 100
# And here
my_pipeline = MyPipeline(model=model, tokenizer=tokenizer, ...)
# or if you use *pipeline* function, then:
my_pipeline = pipeline(model="xxxx", pipeline_class=MyPipeline)
```
ใใใซใใใๅฟ
่ฆใชใซในใฟใ ใณใผใใใในใฆๅฎ่กใงใใใใใซใชใใพใใ
## Implementing a pipeline
[Implementing a new pipeline](../add_new_pipeline)
## Audio
ใชใผใใฃใช ใฟในใฏใซไฝฟ็จใงใใใใคใใฉใคใณใซใฏๆฌกใฎใใฎใใใใพใใ
### AudioClassificationPipeline
[[autodoc]] AudioClassificationPipeline
- __call__
- all
### AutomaticSpeechRecognitionPipeline
[[autodoc]] AutomaticSpeechRecognitionPipeline
- __call__
- all
### TextToAudioPipeline
[[autodoc]] TextToAudioPipeline
- __call__
- all
### ZeroShotAudioClassificationPipeline
[[autodoc]] ZeroShotAudioClassificationPipeline
- __call__
- all
## Computer vision
ใณใณใใฅใผใฟใผ ใใธใงใณ ใฟในใฏใซไฝฟ็จใงใใใใคใใฉใคใณใซใฏๆฌกใฎใใฎใใใใพใใ
### DepthEstimationPipeline
[[autodoc]] DepthEstimationPipeline
- __call__
- all
### ImageClassificationPipeline
[[autodoc]] ImageClassificationPipeline
- __call__
- all
### ImageSegmentationPipeline
[[autodoc]] ImageSegmentationPipeline
- __call__
- all
### ImageToImagePipeline
[[autodoc]] ImageToImagePipeline
- __call__
- all
### ObjectDetectionPipeline
[[autodoc]] ObjectDetectionPipeline
- __call__
- all
### VideoClassificationPipeline
[[autodoc]] VideoClassificationPipeline
- __call__
- all
### ZeroShotImageClassificationPipeline
[[autodoc]] ZeroShotImageClassificationPipeline
- __call__
- all
### ZeroShotObjectDetectionPipeline
[[autodoc]] ZeroShotObjectDetectionPipeline
- __call__
- all
## Natural Language Processing
่ช็ถ่จ่ชๅฆ็ใฟในใฏใซไฝฟ็จใงใใใใคใใฉใคใณใซใฏๆฌกใฎใใฎใใใใพใใ
### FillMaskPipeline
[[autodoc]] FillMaskPipeline
- __call__
- all
### NerPipeline
[[autodoc]] NerPipeline
่ฉณ็ดฐใซใคใใฆใฏใ[`TokenClassificationPipeline`] ใๅ็
งใใฆใใ ใใใ
### QuestionAnsweringPipeline
[[autodoc]] QuestionAnsweringPipeline
- __call__
- all
### SummarizationPipeline
[[autodoc]] SummarizationPipeline
- __call__
- all
### TableQuestionAnsweringPipeline
[[autodoc]] TableQuestionAnsweringPipeline
- __call__
### TextClassificationPipeline
[[autodoc]] TextClassificationPipeline
- __call__
- all
### TextGenerationPipeline
[[autodoc]] TextGenerationPipeline
- __call__
- all
### Text2TextGenerationPipeline
[[autodoc]] Text2TextGenerationPipeline
- __call__
- all
### TokenClassificationPipeline
[[autodoc]] TokenClassificationPipeline
- __call__
- all
### TranslationPipeline
[[autodoc]] TranslationPipeline
- __call__
- all
### ZeroShotClassificationPipeline
[[autodoc]] ZeroShotClassificationPipeline
- __call__
- all
## Multimodal
ใใซใใขใผใใซ ใฟในใฏใซไฝฟ็จใงใใใใคใใฉใคใณใซใฏๆฌกใฎใใฎใใใใพใใ
### DocumentQuestionAnsweringPipeline
[[autodoc]] DocumentQuestionAnsweringPipeline
- __call__
- all
### FeatureExtractionPipeline
[[autodoc]] FeatureExtractionPipeline
- __call__
- all
### ImageFeatureExtractionPipeline
[[autodoc]] ImageFeatureExtractionPipeline
- __call__
- all
### ImageToTextPipeline
[[autodoc]] ImageToTextPipeline
- __call__
- all
### ImageTextToTextPipeline
[[autodoc]] ImageTextToTextPipeline
- __call__
- all
### VisualQuestionAnsweringPipeline
[[autodoc]] VisualQuestionAnsweringPipeline
- __call__
- all
## Parent class: `Pipeline`
[[autodoc]] Pipeline
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