Repository: huggingface/transformers

Issue:
Pipeline Loading Models and Tokenizers
# ❓ Questions & Help

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## Details
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Hi I'm trying to use 'fmikaelian/flaubert-base-uncased-squad' for question answering. I understand that I should load the model and the tokenizers. I'm not sure how should I do this. 

My code is basically far

`
from transformers import pipeline, BertTokenizer

nlp = pipeline('question-answering', \
model='fmikaelian/flaubert-base-uncased-squad', \
tokenizer='fmikaelian/flaubert-base-uncased-squad')`

Most probably this can be solve with a two liner.

Many thanks

<!-- You should first ask your question on SO, and only if
     you didn't get an answer ask it here on GitHub. -->
**A link to original question on Stack Overflow**: 
https://stackoverflow.com/questions/60287465/pipeline-loading-models-and-tokenizers


Discussion:
Also cc'ing @fmikaelian on this for information :)
Apologize for the careless mistake @fmikaelian 
Hi, other than the careless mistake, I'm trying to understand why I cannot load any model from transformers S3 repo. I have tried :

1) from transformers import FlaubertModel, FlaubertTokenizer

2) from transformers import CamembertTokenizer

3)from transformers import CamembertModel


4)from transformers import BertModel
model = BertModel.from_pretrained('bert-base-uncased') 

Only the forth option has triggered the download process. All other options return : 
`"ImportError: cannot import name 'CamembertModel'"`

 i was wondering if there is an issue since I'm using conda in a Windows PC.  

Many thanks for your help.



I tried to update transformers with conda but that did not work and I also tried to do some pip install but also getting some errors:

```
File "C:\Users\Ruben Contesti\AppData\Local\Continuum\Anaconda3\envs\...\lib\site-packages\transformers\configuration_utils.py", line 145, in from_pretrained
    raise EnvironmentError(msg)
OSError: Model name 'flaubert-base-uncased-squad' was not found in model name list (bert-base-uncased, bert-large-uncased, bert-base-cased, bert-large-cased, bert-base-multilingual-uncased, bert-base-multilingual-cased, bert-base-chinese, bert-base-german-cased, bert-large-uncased-whole-word-masking, bert-large-cased-whole-word-masking, bert-large-uncased-whole-word-masking-finetuned-squad, bert-large-cased-whole-word-masking-finetuned-squad, bert-base-cased-finetuned-mrpc, bert-base-german-dbmdz-cased, bert-base-german-dbmdz-uncased). We assumed 'flaubert-base-uncased-squad' was a path or url to a configuration file named config.json or a directory containing such a file but couldn't find any such file at this path or url.
```
As pointed out in my Stackoverflow answer, I suspect a versioning conflict. I successfully managed to load the pipeline in `2.5.0`, but had errors in `2.4.1` (not quite the same as @rcontesti , but similar enough for me to assume problems with an older version).
Do you have torch installed in your environment? That might explain why you can't import `CamembertModel`.

The error 
```
OSError: Model name 'flaubert-base-uncased-squad' was not found in model name list (bert-base-uncased, bert-large-uncased, bert-base-cased, bert-large-cased, bert-base-multilingual-uncased, bert-base-multilingual-cased, bert-base-chinese, bert-base-german-cased, bert-large-uncased-whole-word-masking, bert-large-cased-whole-word-masking, bert-large-uncased-whole-word-masking-finetuned-squad, bert-large-cased-whole-word-masking-finetuned-squad, bert-base-cased-finetuned-mrpc, bert-base-german-dbmdz-cased, bert-base-german-dbmdz-uncased). We assumed 'flaubert-base-uncased-squad' was a path or url to a configuration file named config.json or a directory containing such a file but couldn't find any such file at this path or url.
```

means you're trying to load a flaubert checkpoint in BERT. Could you share the code that raised the last error so that we may try to reproduce the error?
Guyz thank so much for your answers. I was able to solve the version problem but now I'm running into a different problem(Should I open a new thread?):

I'm currently using:

```py
model_=transformers.FlaubertForQuestionAnswering
tokenizer_ = transformers.FlaubertTokenizer
```

But when I place them into pipeline:

```py
nlp = pipeline('question-answering', \
        model=model, \
        tokenizer=tokenizer)
```

I'm getting the following error:

```
Traceback (most recent call last):
  File "C:\Users\Ruben Contesti\AppData\Local\Continuum\Anaconda3\envs\..\lib\multiprocessing\pool.py", line 119, in worker
    result = (True, func(*args, **kwds))
  File "C:\Users\Ruben Contesti\AppData\Local\Continuum\Anaconda3\envs\..\lib\multiprocessing\pool.py", line 44, in mapstar
    return list(map(*args))
  File "C:\Users\Ruben Contesti\AppData\Local\Continuum\Anaconda3\envs\..\lib\site-packages\transformers\data\processors\squad.py", line 105, in squad_convert_example_to_features
    sub_tokens = tokenizer.tokenize(token)
TypeError: tokenize() missing 1 required positional argument: 'text'
"""

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "question_extraction.py", line 61, in <module>
    answer, score=question_extraction(text, question_, model_, tokenizer_, language_, verbose= True)
  File "question_extraction.py", line 44, in question_extraction
    output=nlp({'question':question, 'context': text})
  File "C:\Users\Ruben Contesti\AppData\Local\Continuum\Anaconda3\envs\..\lib\site-packages\transformers\pipelines.py", line 802, in __call__
    for example in examples
  File "C:\Users\Ruben Contesti\AppData\Local\Continuum\Anaconda3\envs\socgen_nlp\lib\site-packages\transformers\pipelines.py", line 802, in <listcomp>
    for example in examples
  File "C:\Users\Ruben Contesti\AppData\Local\Continuum\Anaconda3\envs\..\lib\site-packages\transformers\data\processors\squad.py", line 316, in squad_convert_examples_to_features
    desc="convert squad examples to features",
  File "C:\Users\Ruben Contesti\AppData\Local\Continuum\Anaconda3\envs\..\lib\site-packages\tqdm\std.py", line 1097, in __iter__
    for obj in iterable:
  File "C:\Users\Ruben Contesti\AppData\Local\Continuum\Anaconda3\envs\..\lib\multiprocessing\pool.py", line 320, in <genexpr>
    return (item for chunk in result for item in chunk)
  File "C:\Users\Ruben Contesti\AppData\Local\Continuum\Anaconda3\envs\..\lib\multiprocessing\pool.py", line 735, in next
    raise value
TypeError: tokenize() missing 1 required positional argument: 'text'
convert squad examples to features:   0%|
```
You need to initialize your model and tokenizer with a checkpoint, for example instead of 
```py
model_=transformers.FlaubertForQuestionAnswering
tokenizer_ = transformers.FlaubertTokenizer
```
You would specify a flaubert checkpoint:
```py
model_ = transformers.FlaubertModel.from_pretrained("fmikaelian/flaubert-base-uncased-squad")
tokenizer_ = transformers.FlaubertTokenizer.from_pretrained("fmikaelian/flaubert-base-uncased-squad")
```

I chose a community checkpoint that was trained using question answering. You can check all available FlauBERT models [here](https://huggingface.co/models?search=flaubert).
Once again many thanks @LysandreJik  for the help. I proceed as suggested and now when I'm trying to put both the tokenizer and the model into pipeline I'm running into the following error:

`Traceback (most recent call last):
  File "question_extraction.py", line 72, in <module>
    answer, score=question_extraction(text, question_, model_, tokenizer_, language_, verbose= True)
  File "question_extraction.py", line 55, in question_extraction
    output=nlp({'question':question, 'context': text})
  File "C:\Users\Ruben Contesti\AppData\Local\Continuum\Anaconda3\envs\..\lib\site-packages\transformers\pipelines.py", line 818, in __call__
    start, end = self.model(**fw_args)
ValueError: not enough values to unpack (expected 2, got 1)`

It seems like the dictionary of values start and end I'm getting is not a tuple or something like that.
I updated the code so that it loads a previously saved model

```python

tokenizer_ = FlaubertTokenizer.from_pretrained(MODELS)
model_ = FlaubertModel.from_pretrained(MODELS)

def question_extraction(text, question, model, tokenizer, language="French", verbose=False):
    
    if language=="French":
        nlp = pipeline('question-answering', \
        model=model, \
        tokenizer=tokenizer)
    else:
        nlp=pipeline('question-answering')

    output=nlp({'question':question, 'context': text})

    answer, score = output.answer, output.score 

    if verbose==True:
        print("Q: ", question ,"\n",\
              "A:", answer,"\n", \
              "Confidence (%):", "{0:.2f}".format(str(score*100) )
              )
    
    return answer, score

if __name__=="__main__":
    question_="Quel est le montant de la garantie?"
    language_="French"
    text="le montant de la garantie est € 1000"

    answer, score=question_extraction(text, question_, model_, tokenizer_, language_, verbose= True)


```
 But now I'm getting an unpacking error:

```
C:\...\NLP\src>python question_extraction.py
OK
OK
convert squad examples to features: 100%|████████████████████████████████████████████████| 1/1 [00:00<00:00,  4.66it/s]
add example index and unique id: 100%|███████████████████████████████████████████████████████████| 1/1 [00:00<?, ?it/s]
Traceback (most recent call last):
  File "question_extraction.py", line 77, in <module>
    answer, score=question_extraction(text, question_, model_, tokenizer_, language_, verbose= True)
  File "question_extraction.py", line 60, in question_extraction
    output=nlp({'question':question, 'context': text})
  File "C:\...\transformers\pipelines.py", line 818, in __call__
    start, end = self.model(**fw_args)
ValueError: not enough values to unpack (expected 2, got 1)

```
Hi @rcontesti, I've investigated further and found a few issues. First of all, the checkpoint you're trying to load is `fmikaelian/flaubert-base-uncased-squad`, which unfortunately cannot be used by pipelines.

This is because this model was fine-tuned with `FlaubertForQuestionAnswering` instead of `FlaubertForQuestionAnsweringSimple`, and only the latter can be used by pipelines. Since it was fine-tuned leveraging a different architecture for the QA head, it, unfortunately, won't be usable by pipelines. The usage example on the [models page](https://huggingface.co/fmikaelian/flaubert-base-uncased-squad) is misleading because of that (cc @fmikaelian).

Unfortunately, there is no French model that can be used with the pipelines, so you would need to do a custom inference leveraging the model. We don't have any examples showcasing how to leverage `XLNet/XLM/FlaubertForQuestionAnswering`, but it is on our roadmap.
@LysandreJik many thanks for your answer. It was very clarifying.

Some follow up questions on my side:

1. If I use FlaubertForQuestionAnsweringSimple then can I use pipelines? If that is the case would you show me how?
2. Is it also the case that I cannot use CammmBert for QA?
3. I guess that because we have different architectures theres is no quick hack to adapt it to pipelines, am I getting it right?
4. If I were to do custom inferencing, without pipelines and only using pytorch, would you mind showing me the resources to do so?

Many thanks!!!



1. You can indeed use `FlaubertForQuestionAnsweringSimple` with pipelines, the issue is that there is currently no model fine-tuned on QA for this model.
2. You could also use the `CamembertForQuestionAnswering` model with pipelines I believe, but unfortunately there is no model fine-tuned on QA for this model either.
3. Indeed, we should add these down the line, but it is not very high on our priority list right now cc @mfuntowicz 
4. Yes, I'm currently working on some [examples](https://github.com/huggingface/transformers/pull/2850) that should be merged sometimes today. I'll look into using a `XLNet/XLM/FlaubertForQuestionAnswering` and their differing architecture as well.
@rcontesti @LysandreJik 

I will fine-tune `FlaubertForQuestionAnsweringSimple` and `CamembertForQuestionAnswering` on French QA in the next days and let you know if we can use the pipeline with those
@fmikaelian, @LysandreJik 

Many thanks for the help. Eventually I could train it myself, I haven't use Pytorch in a year but if you could point to a good dataset I could do training. Many thanks!
@rcontesti @LysandreJik 

I fine-tuned `FlaubertForQuestionAnsweringSimple` on [FQuAD](https://fquad.illuin.tech/), by editing `run_squad.py` using the same approach as #2746, but still got `ValueError: not enough values to unpack (expected 2, got 1)` when using the model with a pipeline.

I also fine-tuned `CamembertForQuestionAnswering` on [FQuAD](https://fquad.illuin.tech/) and [French-SQuAD](https://github.com/Alikabbadj/French-SQuAD), and pipelines are working :-]

```python3
from transformers import pipeline

nlp = pipeline('question-answering', model='fmikaelian/camembert-base-squad', tokenizer='fmikaelian/camembert-base-squad')

nlp({
    'question': "Qui est Claude Monet?",
    'context': "Claude Monet, né le 14 novembre 1840 à Paris et mort le 5 décembre 1926 à Giverny, est un peintre français et l’un des fondateurs de l'impressionnisme."
})
```

```
{'answer': 'un peintre français',
 'end': 106,
 'score': 0.498404793881182,
 'start': 87}
```

Model links:

- [`fmikaelian/camembert-base-fquad`](https://huggingface.co/fmikaelian/camembert-base-fquad)
- [`fmikaelian/camembert-base-squad`](https://huggingface.co/fmikaelian/camembert-base-squad)

Will open a PR for models cards (#3089)
@fmikaelian That's really cool, thanks for taking the time to fine-tune those models! I'll look into the error with the pipeline ASAP, I'm pretty sure I know where it comes from.

Really cool to have the first community model for question answering in French!

Resolving patch:
diff --git a/src/transformers/modeling_auto.py b/src/transformers/modeling_auto.py
--- a/src/transformers/modeling_auto.py
+++ b/src/transformers/modeling_auto.py
@@ -73,7 +73,7 @@
 )
 from .modeling_flaubert import (
     FLAUBERT_PRETRAINED_MODEL_ARCHIVE_MAP,
-    FlaubertForQuestionAnswering,
+    FlaubertForQuestionAnsweringSimple,
     FlaubertForSequenceClassification,
     FlaubertModel,
     FlaubertWithLMHeadModel,
@@ -92,7 +92,7 @@
 from .modeling_transfo_xl import TRANSFO_XL_PRETRAINED_MODEL_ARCHIVE_MAP, TransfoXLLMHeadModel, TransfoXLModel
 from .modeling_xlm import (
     XLM_PRETRAINED_MODEL_ARCHIVE_MAP,
-    XLMForQuestionAnswering,
+    XLMForQuestionAnsweringSimple,
     XLMForSequenceClassification,
     XLMModel,
     XLMWithLMHeadModel,
@@ -106,7 +106,7 @@
 )
 from .modeling_xlnet import (
     XLNET_PRETRAINED_MODEL_ARCHIVE_MAP,
-    XLNetForQuestionAnswering,
+    XLNetForQuestionAnsweringSimple,
     XLNetForSequenceClassification,
     XLNetForTokenClassification,
     XLNetLMHeadModel,
@@ -220,9 +220,9 @@
         (AlbertConfig, AlbertForQuestionAnswering),
         (RobertaConfig, RobertaForQuestionAnswering),
         (BertConfig, BertForQuestionAnswering),
-        (XLNetConfig, XLNetForQuestionAnswering),
-        (FlaubertConfig, FlaubertForQuestionAnswering),
-        (XLMConfig, XLMForQuestionAnswering),
+        (XLNetConfig, XLNetForQuestionAnsweringSimple),
+        (FlaubertConfig, FlaubertForQuestionAnsweringSimple),
+        (XLMConfig, XLMForQuestionAnsweringSimple),
     ]
 )
 


Test patch: