Apply Neural Net to Unlabelled Data
Hi everyone,
first of all I'm pretty new to Rapidminer. I'm a student and working with the tool for educational purposes.
I built a model for predicting a binominal outcome using a neural network. I have a training dataset and one unlabelled for application. Both datasets have the same structure. I managed to train my neural network in a cross validation operator and measure the performance on the training data and I can also apply this to my application data. And after applying the model to the application data 3 new columns are created (predicted(outcome), confidence yes/no), but I'm not sure if I'm doing this right... I can't use another performance operator after the application of the model, because it would require a labelled input. Is there another way to get the same performance vector matrix as for the training data in order to check accuracy, precision and recall for the new application data or would this require a labelled data set? How can I check the performance of my model nonetheless?
I'd really appreciate your help!
Greets John
Best Answer
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Hi John,
Actually it sounds like you're doing it right, what I tend to do is before building the model, split my data into a Training set & a Test set.
So you have 3 datasets:- Training
- You can train your model on this dataset, in this step I perform a Cross Validation to see how the model 'should' perform in practice.
- Testing
- Here you have a dataset which you can apply the model on, but it ALSO has the historic labels. So you can use this to measure the performance of your model. I can test many models together and select the best performing ones using the Compare Models operator.
- Unlabelled (Scoring)
- Once you have tested your model and are pretty confident in it, then you can apply it to your data and can 'trust' that the performance should be close to your testing.
Try this now and look at the results. Great right!
However, how can you be really sure you can 'trust' your model? You've only tested it once, maybe it just got 'lucky' and in reality it's not going to perform as expected.
There's various ways to ensure you can trust your tested model performance, so after you've tried out the Split Validation I'd like you to read this series of 4 blog posts by @IngoRM and download the Repository with sample processes.
Let us know here how you get on!
Learn the Right Way to Validate Models
2 - Training
Answers
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You can output the PER port from the Validation operator to get the performance measures.
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Hi John,
Actually it sounds like you're doing it right, what I tend to do is before building the model, split my data into a Training set & a Test set.
So you have 3 datasets:- Training
- You can train your model on this dataset, in this step I perform a Cross Validation to see how the model 'should' perform in practice.
- Testing
- Here you have a dataset which you can apply the model on, but it ALSO has the historic labels. So you can use this to measure the performance of your model. I can test many models together and select the best performing ones using the Compare Models operator.
- Unlabelled (Scoring)
- Once you have tested your model and are pretty confident in it, then you can apply it to your data and can 'trust' that the performance should be close to your testing.
Try this now and look at the results. Great right!
However, how can you be really sure you can 'trust' your model? You've only tested it once, maybe it just got 'lucky' and in reality it's not going to perform as expected.
There's various ways to ensure you can trust your tested model performance, so after you've tried out the Split Validation I'd like you to read this series of 4 blog posts by @IngoRM and download the Repository with sample processes.
Let us know here how you get on!
Learn the Right Way to Validate Models
2 - Training
-
Thanks a lot for your help!
It made things a lot clearer for me and guided me to a functioning model. Now I'm starting to improve the various parameters..
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hi
How can I use the neural network for degree of cancer spread?thanks0 -
Hi @abbasi_samira,
Can you share your dataset(s) and your process (if you have one), please ?
Regards,
Lionel
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Hello
Unfortunately, due to security, I can not share data
But I can explain more fully about it0 -
Hi again @abbasi_samira,
OK, I understand.
Yes you can can explain more fully and maybe share a "fictive example set" inspired
from your data (to know the size and structure of your data).
Regards,
Lionel
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