Unable to train from feedback with mitie-sklearn backend

I was building a bot using wit.ai Recently i am planning to move from wit.ai to rasa.ai I exported the expressions from witai and trained them in rasa.ai

When I am trying to retrain the model with new expressions and new/existing intents, I am getting errors like:

1. ValueError: Found array with 0 sample(s) (shape=(0,)) while a minimum of 1 is required.
2. ValueError: models greater than splits
3. ValueError: The number of classes has to be greater than one; got 1

The input file to train is:

curl -XPOST localhost:5000/train -d'{  
   "rasa_nlu_data":{  
      "intent_examples":[  
         {  
            "text":"Receive calls on  vogapp",
            "intent":"vogapp_call_outgoing",
            "entities":[  

            ]
         },
         {  
            "text":"Receive calls on vogapp",
            "intent":"vogapp_call_outgoing",
            "entities":[  

            ]
         },
         {  
            "text":"Receive calls on vogapp",
            "intent":"vogapp_call_outgoing",
            "entities":[  

            ]
         },
         {  
            "text":"can i make calls to any operator using vogapp",
            "intent":"vogapp_call_outgoing",
            "entities":[  

            ]
         },
         {  
            "text":"can i make calls to any operator using   vogapp",
            "intent":"vogapp_call_outgoing",
            "entities":[  

            ]
         },
         {  
            "text":"can i make calls to any operator using vogapp",
            "intent":"vogapp_call_outgoing",
            "entities":[  

            ]
         },
         {  
            "text":"can i make calls to any operator using   vogapp",
            "intent":"vogapp_call_outgoing",
            "entities":[  

            ]
         },
         {  
            "text":"can i receive calls from any operator on vogapp",
            "intent":"vogapp_call_outgoing",
            "entities":[  

            ]
         },
         {  
            "text":"can i receive calls from other operator on vogapp",
            "intent":"vogapp_call_outgoing",
            "entities":[  

            ]
         },
         {  
            "text":"can i receive calls from any operator on vogapp",
            "intent":"vogapp_call_outgoing",
            "entities":[  

            ]
         },
         {  
            "text":"can i receive calls from any operator on   vogapp",
            "intent":"vogapp_call_outgoing",
            "entities":[  

            ]
         },
         {  
            "text":"Can I make a vogapp call without going into the app",
            "intent":"vogapp_call_query",
            "entities":[  

            ]
         },
         {  
            "text":"Can I make a vogapp call without going into the app",
            "intent":"vogapp_call_query",
            "entities":[  

            ]
         }
      ]
   }
}'

There are more than one class and more than one expression for each of them. I am unable to understand why these errors are coming.

[tmbo]

I ve created a seperate issue describing the underlying issue. #198

[tmbo]

Right, ok the issue is that you need more training samples (i think at least 3 per intent for spacy / mitie-sklearn).