Error with SquadV2 Metrics
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I can't seem to import squad v2 metrics. 

**squad_metric = nlp.load_metric('squad_v2')**

**This throws me an error.:**


```
ImportError                               Traceback (most recent call last)
<ipython-input-8-170b6a170555> in <module>
----> 1 squad_metric = nlp.load_metric('squad_v2')

~/env/lib64/python3.6/site-packages/nlp/load.py in load_metric(path, name, process_id, num_process, data_dir, experiment_id, in_memory, download_config, **metric_init_kwargs)
    426     """
    427     module_path = prepare_module(path, download_config=download_config, dataset=False)
--> 428     metric_cls = import_main_class(module_path, dataset=False)
    429     metric = metric_cls(
    430         name=name,

~/env/lib64/python3.6/site-packages/nlp/load.py in import_main_class(module_path, dataset)
     55     """
     56     importlib.invalidate_caches()
---> 57     module = importlib.import_module(module_path)
     58 
     59     if dataset:

/usr/lib64/python3.6/importlib/__init__.py in import_module(name, package)
    124                 break
    125             level += 1
--> 126     return _bootstrap._gcd_import(name[level:], package, level)
    127 
    128 

/usr/lib64/python3.6/importlib/_bootstrap.py in _gcd_import(name, package, level)

/usr/lib64/python3.6/importlib/_bootstrap.py in _find_and_load(name, import_)

/usr/lib64/python3.6/importlib/_bootstrap.py in _find_and_load_unlocked(name, import_)

/usr/lib64/python3.6/importlib/_bootstrap.py in _load_unlocked(spec)

/usr/lib64/python3.6/importlib/_bootstrap_external.py in exec_module(self, module)

/usr/lib64/python3.6/importlib/_bootstrap.py in _call_with_frames_removed(f, *args, **kwds)

~/env/lib64/python3.6/site-packages/nlp/metrics/squad_v2/a15e787c76889174874386d3def75321f0284c11730d2a57e28fe1352c9b5c7a/squad_v2.py in <module>
     16 
     17 import nlp
---> 18 from .evaluate import evaluate
     19 
     20 _CITATION = """\

ImportError: cannot import name 'evaluate'
```
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