found "Dice": 0.0

[LimxRabbit]

hi~when i train my own NIH dataset, the training process is normal, but some of the inference dicee is zero, do you know how to solve it?
for exmaple:
"1": {
"Accuracy": 0.9971808456793064,
"Dice": 0.0,
"False Discovery Rate": NaN,
"False Negative Rate": 1.0,
"False Omission Rate": 0.0028191543206935975,
"False Positive Rate": 0.0,
"Jaccard": 0.0,
"Negative Predictive Value": 0.9971808456793064,
"Precision": NaN,
"Recall": 0.0,
"Total Positives Reference": 151500,
"Total Positives Test": 0,
"True Negative Rate": 1.0
},