Change high calorie threshold to 300

[tommylau-exe]

This change adjusts how data in the FDC data set is classified as high calorie. Now, any dish with over 300kcals per 100g of food is "high calorie." This better balances the classes in the data set, and is a more realistic number based on people eating 1.5-2kg of food per day.

[tommylau-exe]

Putting the new rough metrics in the PR here for posterity:

Data Set Class Balance

• Low calorie: 25%
• Average calorie: 30%
• High calorie: 45%

ML Model Metrics

• Categorical Accuracy: 83%
• Precision 0.84
• Recall: 0.81
• F1 Score: 0.82
• Per-Category F1 Scores
  • Low-Calorie: 0.83
  • Average-Calorie: 0.77
  • High-Calorie: 0.88

Confusion Matrix

	Predicted Low-Calorie	Predicted Average-Calorie	Predicted High-Calorie
Actual Low-Calorie	11203	1712	591
Actual Average Calorie	1602	13103	2120
Actual High-Calorie	752	2472	20791