: A data structure where each row represents a single observation and features are stacked vertically (the "tidy" data format).

While there is no single widely-known document with this exact name, the "103_gram" and ".txt" format suggest a few technical possibilities:

: In NLP, files named with "gram" often contain frequency lists of word sequences (n-grams). "103_gram" could refer to a specific subset of 1-gram (unigram) or 3-gram (trigram) data from a larger corpus like the Google Books Ngram Viewer .

In data science and machine learning, a typically refers to: