Consider a set of documents. Assume that all documents have been normal- ized to have unit length of 1. What is the “shape” of a cluster that consists of all documents whose cosine similarity to a centroid is greater than some specified constant? In other words, cos(d, c) ? ?, where 0 < ? ? 1.
What will be an ideal response?
Once document vectors have been normalized, they lie on am n-dimensional
hypershpere. The constraint that all documents have a minimum cosine
similarity with respect to a centroids is a constraint that the document vectors
lie within a cone, whose intersection with the sphere is a circle on the surface
of the sphere.
You might also like to view...
Which of the following statements is false?
a. If an operation requires the executing thread to hold a lock while the operation is performed, a thread must relase the lock before proceeding with the operation. Other threads attempting to perform an operation that requires the same lock will be blocked until the first thread releases the lock, at which point the blocked threads may attempt to acquire the lock and proceed with the operation. b. To specify that a thread must hold a monitor lock to execute a block of code, the code should be placed in a synchronized statement. c. Code in a synchronized statement is said to be guarded by the monitor lock; a thread must acquire the lock to execute the guarded statements. d. The monitor allows only one thread at a time to execute statements within synchronized statements that lock on the same object, as only one thread at a time can hold the monitor lock. The synchronized statements are declared using the synchronized keyword.
The value of the text-indent property can be expressed ____.
A. in ems B. as a percentage C. in pixels D. any of the above
One way to access the desktop in Windows 8 is to press the:
A) Ctrl+Shift+D. B) Ctrl key+D. C) Windows key+D. D) Alt key+F4.
WPA2 has a typical key size of 128 bits
Indicate whether the statement is true or false