Hi ! Can you provide an example of predictions and references that you pass to the metric ?
You defined these feature types:
features=datasets.Features({
  “predictions”: {
    “1”: datasets.Value(“int64”),
    “2”: datasets.Value(“int64”),
    “3”: datasets.Value(“int64”),
  },
  ‘references’: datasets.Value(“int64”),
})

So your predictions must look like this:
predictions = [{"1": i, "2": j, "3": k}]

and your references like this:
references = [r]

where i,j,k,r are supposed to be integers.
Can you check that this is indeed the feature types that you want to use, and that your data match this structure ?