1075
The proposed PCA-RF proved to effectively identify five classes of weld defects with better performance than support vector machine and back propagation neural network .
 engineering feature: weld; concept or principle: defects; concept or principle: performance; application: support; machine or equipment: machine; concept or principle: neural network
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 engineering feature: weld; concept or principle: defects; concept or principle: performance; application: support; machine or equipment: machine; concept or principle: neural network