Is this a bug? 
Hello, 
I tried to import this: 

`from transformers import AdamW, get_linear_schedule_with_warmup`
but got error : model not found
but when i did this, it worked: 
```
from transformers import AdamW
from transformers import WarmupLinearSchedule as get_linear_schedule_with_warmup
```
however when I set the scheduler like this : 
```
scheduler = get_linear_schedule_with_warmup(optimizer, num_warmup_steps=args.warmup_steps, num_training_steps=t_total) 
```
I got this error : 
```
__init__() got an unexpected keyword argument 'num_warmup_steps'
```
duplicated 
https://github.com/huggingface/transformers/issues/1837#issue-523145270<|||||>I checked the other comment but did not work. Any idea ? 
```
__init__() got an unexpected keyword argument 'num_warmup_steps'
```
<|||||>Hi, could you specify which versions of Python and Transformers is your environment running on?<|||||>Thanks
```
python: 3.6.8
Transformers: 2.1.1
```
<|||||>Did you install transformers from source or from pypi?<|||||>Could you try installing from source and telling me if it fixes your problem?<|||||>Thanks it worked<|||||>worked with building from the source and this 
```
from transformers import AdamW,get_linear_schedule_with_warmup
```<|||||>Great to hear!<|||||>whats the meaning of installing from source ,i am a little bit confused. could you please tell me ,thank you.
i've tried   'pip install git+https://github.com/huggingface/transformers' or pip install transformers 
or pip install pytorhc-transformers. But they all doesn't work.<|||||>> Hello,
> I tried to import this:
> 
> `from transformers import AdamW, get_linear_schedule_with_warmup`
> but got error : model not found
> but when i did this, it worked:
> 
> ```
> from transformers import AdamW
> from transformers import WarmupLinearSchedule as get_linear_schedule_with_warmup
> ```
> 
> however when I set the scheduler like this :
> 
> ```
> scheduler = get_linear_schedule_with_warmup(optimizer, num_warmup_steps=args.warmup_steps, num_training_steps=t_total) 
> ```
> 
> I got this error :
> 
> ```
> __init__() got an unexpected keyword argument 'num_warmup_steps'
> ```

can you kindly tell me how to install from source.<|||||>@TLCFYBJJHYYSND See https://github.com/huggingface/transformers#from-source<|||||>In order to install Transformers library, you have to open your command line and enter:
```
pip install git+https://github.com/huggingface/transformers.git
```
> > Hello,
> > I tried to import this:
> > `from transformers import AdamW, get_linear_schedule_with_warmup`
> > but got error : model not found
> > but when i did this, it worked:
> > ```
> > from transformers import AdamW
> > from transformers import WarmupLinearSchedule as get_linear_schedule_with_warmup
> > ```
> > 
> > 
> > however when I set the scheduler like this :
> > ```
> > scheduler = get_linear_schedule_with_warmup(optimizer, num_warmup_steps=args.warmup_steps, num_training_steps=t_total) 
> > ```
> > 
> > 
> > I got this error :
> > ```
> > __init__() got an unexpected keyword argument 'num_warmup_steps'
> > ```
> 
> can you kindly tell me how to install from source.<|||||>Thanks for that, it really works!!!