What is the formula for IDF?Answer choicesSelect only one optionREVISITLog(Total number of documents - Number of documents containing X)Log(Total number of documents + Number of documents containing X)Log(Total number of documents / Number of documents containing X)Log(Total number of documents * Number of documents containing X)

12.What is the formula for calculating TF-IDF score?  A. (Number of times X appears in a document) / (Total number of terms in the document) * log(Total number of documents / Number of documents containing X)  B. (Total number of documents / Number of documents containing X) * log(Number of times X appears in a document) / (Total number of terms in the document)  C. (Number of times X appears in a document) * log(Total number of documents / Number of documents containing X) / (Total number of terms in the document)  D. (Total number of terms in the document) * log(Total number of documents / Number of documents containing X) / (Number of times X appears in a document)

14.In TF-IDF what does IDF stand for?  A. Inverse Document Frequency  B. Indented Document Frequency  C. Index Document Frequency  D. Inverse Data Frequency

Consider a term that appears 15 times in a document of 500 words. In a collection of 1000 documents, this term appears in 200 documents. What is the TF-IDF score for this term?Answer choicesSelect only one optionREVISIT0.10.02090.20.209

True/False: tf-idf weight is a metric derived by taking the log of N divided by the document frequency where N is the total number of documents in a collection.Question 16Select one:TrueFalse

If a document collection contains 1000 documents and each document is represented using TF-IDF vectors with a vocabulary size of 5000 words, what is the dimensionality of the TF-IDF vectors?Question 7Answera.5000b.1000c.2500d.500