Fault Diagnosis for Rolling Bearing under Variable Conditions Based on Image Recognition

Table 3

The rolling bearing data composition under variable conditions for cross-validation.

Cross-validation groups	Training data conditions	⁢Test data conditions
1	1	2	3	4
2	2	1	3	4
3	3	1	2	4
4	4	1	2	3

Note: 1, 2, 3, and 4 in the training data conditions and the test data denote 4 different speed conditions, 1797 rpm, 1772 rpm, 1750 rpm, and 1730 rpm, respectively.