Each number in ner_tags represents an entity. Convert the numbers to their label names to find out what the entities are:

label_list = wnut["train"].features[f"ner_tags"].feature.names
label_list
[
    "O",
    "B-corporation",
    "I-corporation",
    "B-creative-work",
    "I-creative-work",
    "B-group",
    "I-group",
    "B-location",
    "I-location",
    "B-person",
    "I-person",
    "B-product",
    "I-product",
]