Model Reports

Each model you train in a project displays as a tile in the Model List on the right of the Build page. Each model tile shows high-level performance metrics, including the F1 or IoU score for each split.

Model List

Analyze Model Performance

Watch the following video to learn how to use the model report metrics and confusion matrix to analyze and improve model performance.

Model List Overview

Here's a quick introduction to the elements of the Model List:

Key Elements of the Model List

View Confusion Matrix

Click View Confusion Matrix to see the model performance metrics and confusion matrix.

Performance

Performance Score for Each Split

The Performance section shows how the model performed on the Train, Dev, and Test sets (see more information about splits here). The number in parentheses is the number of images in the split.

For Object Detection, Segmentation, and Anomaly Detection projects, the scores are based on the confidence threshold that displays. This is the confidence threshold with the best F1 score for all labeled data.

The Performance score unit depends on the project type:

• Object Detection, Classification, Anomaly Detection: F1 Score
• Segmentation: Intersection Over Union (IoU)

Object Detection, Classification, Anomaly Detection: F1 Score

The Performance section for Object Detection, Classification, and Anomaly Detection projects shows the F1 score for each split.

F1 Scores for Splits in an Object Detection Project

Segmentation: Intersection Over Union (IoU)

The Performance section for Segmentation projects shows the Intersection over Union (IoU) score for each split.

IoU Scores for Splits in a Segmentation Project

Precision

Select Precision from the drop-down in the Performance section to see the Precision scores for each split.

Precision Scores for Splits in an Object Detection Project

Recall

Select Recall from the drop-down in the Performance section to see the Recall scores for each split.

Recall Scores for Splits in an Object Detection Project

Confusion Matrix

Click View Confusion Matrix on a model tile to see the confusion matrix.

View Confusion Matrix

The confusion matrix counts ground truth labels versus model predictions. The confusion matrix shown here is for the dataset that the model was trained on.

The y-axis represents each ground truth label. The x-axis represents each possible model prediction. 

Each cell shows the count of instances that correspond to particular ground truth class-predicted class pair. For example, in the image below, the model correctly predicted the class "Hard Hat" 32 times and misclassified it 2 times.

Confusion Matrix in an Object Detection Project

Precision Score for Class

The Precision score for each class is listed along the x-axis. Precision answers the natural language question, “When the model predicts Class A, how often is it correct?” 

The Precision score for a class is the percentage of instances that the model correctly predicted the class out of all instances that the model predicted the class, and is calculated using this equation:

   

For example, let’s calculate the Precision score for the Wheat class in the image below. The model predicts Wheat 7 times. Of those, 6 are correct (True Positives) and 1 is incorrect (False Positives). When we plug those numbers into the Precision equation, we see that the Precision for this class is 85.7%.

   

    

Precision for Wheat

Recall Score for Class

The Recall score for each class is listed along the y-axis. Recall answers the natural language question, “Of all the Class As in the dataset, what percent of them are found by the model?”

The Recall score for a class is the percentage of instances that the model correctly predicted the class out of all actual instances of the class, and is calculated using this equation:

For example, let’s calculate the Recall score for the Wheat class in the image below. The dataset has 8 instances of Wheat. The model predicts 6 instances correctly (True Positives) and 2 instances incorrectly (False Negatives). When we plug those numbers into the Recall equation, we see that the Recall for this class is 75.0%.

   

    

Recall for Wheat

Use Colors to Help Interpret Performance

Each cell has a color that can quickly help you identify correct classifications and errors. Darker colors indicate a higher number, and lighter colors indicate a lower number. 

For example, if the model correctly predicts all instances, only the cells on the diagonal will be blue and have non-zero values. See the following image as an example.

The Model Predicted All Classes Correctly in this Evaluation Set

If any off-diagonal cells contain values, start by looking for the darker colors to understand where the model is making errors. For example, let’s say you want to evaluate performance for the Rice class using the confusion matrix below. The model correctly predicted 1 instance and misclassified 3 instances. Consider looking at the instances that were misclassified as Corn first, since that cell is darker (and has a higher number) than the Wheat cell.

When Evaluating Performance for the "Rice" Class, First Look at Instances Misclassified as "Corn"

Try Model

After you train a model, you can test its performance by using the Try Model tool. Using Try Model is a good way to "spot-check" a model's performance.

When you click Try Model, you can upload a few images to see how the model performs on them. Ideally, you should upload images that aren't already in the dataset and that match your real-world use case. If the model performs well on the new images, you can deploy it. If the model doesn't perform well on the images, try uploading and labeling more images in your project. Then run Try Model again.

The Try Model tool runs inference on each image, so using this tool costs 1 credit per image. (The credit cost is not applicable when using LandingLens on Snowflake.)

To use Try Model:

1. Open a project to the Build tab.
2. Click Model List to view all models in the project.
3. Click Try Model on the model you want to use. (You can also click a model tile to open the model, and then click Try Model.)
   Try Model
4. Upload images.
   Upload a Few Images
5. LandingLens runs the model and shows you the results. Adjust the Confidence Threshold slider (for Object Detection and Segmentation) or Anomaly Thresholdslider (for Anomaly Detection) to see how the model performs with different thresholds. Typically, a lower threshold means that you will see more predictions, while a higher threshold means you will see fewer.
   See How the Model Performs on the Images

Download CSV of Model Predictions

For Object Detection and Classification projects, you can download a CSV that shows the ground truth labels and model predictions for images. You can download the CSV:

• For images in a model dataset
• For select images

Download CSV: Model Predictions for Images in a Model Dataset

You can download a CSV of model predictions for the dataset of images that a model was trained on. This is available for Object Detection and Classification projects.

The prediction data in the CSV will be based on the selected model and its default confidence threshold.

To download the CSV for images in a model's dataset:

1. Open a project to the Build tab.
2. Click Model List to view all models in the project.
3. Click the Actions icon (...) on the model tile and click Download CSV. (You can also click a model tile to open the model, and then click Download CSV).
   Download CSV for the Selected Model
4. The file is downloaded to your computer. For a description of all data in the file, go to CSV Data.

Download CSV: Model Predictions for Select Images

You can download a CSV of model predictions for select images in your Object Detection or Classification dataset. 

The prediction data in the CSV will be based on the selected model and confidence threshold (if you manually change the threshold, that threshold is used in the CSV). 

If a model hasn't been created in the project yet, the prediction fields in the CSV will be blank.

To download the CSV for select images in a dataset:

1. Open a project to the Build tab.
2. Select the model you want to see the predictions for from the Prediction/Model drop-down menu.
   Select a Model
3. Select the images you want to download the CSV for.
4. Click Options in the action bar near the bottom of the screen and select Download CSV.
   Download CSV
5. Click Download on the pop-up window that opens.
   Download
6. The file is downloaded to your computer. For a description of all data in the file, go to CSV Data.

CSV Data

View on Models Page

To adjust the threshold, view visual predictions, or compare the model to other models in the same project, open the model in the Models tab.

The Model List has a few shortcuts to the Models tab:

• Click the Actions icon (...) on the model tile and click View on Models Page.
  
• Click View Confusion Matrix on a model tile and click View Full Report.
  
• Click View Confusion Matrix on a model tile, click the Actions icon (...) and click View on Models Page.
  

Go to Snapshot Page

The Model List has a few shortcuts to the Snapshot page:

• Click the Actions icon (...) on the model tile and click Go to Snapshot Page.
  
• Click a model tile, click the Actions icon (...) and click Go to Snapshot Page.