This avoids pickle memory errors and allows mmap’ing large arrays back on load efficiently.
Dimensionality reduction using truncated SVD (aka LSA).
Furthermore we know that the intrinsic dimensionality of the data is much lower than 4096 since all pictures of human faces look somewhat alike.
The samples lie on a manifold of much lower dimension (say around 200 for instance).
This chapter presents a method for an automatic identification of persons by iris recognition.
This allows the projection of users and items (or documents and terms) into a common vector space representation that is often referred to as the latent semantic representation.
In that context, it is known as latent semantic analysis (LSA). Read more in the If int, random_state is the seed used by the random number generator; If Random State instance, random_state is the random number generator; If None, the random number generator is the Random State instance used by and the output from transform depend on the algorithm and random state.
This estimator supports two algorithms: a fast randomized SVD solver, and a “naive” algorithm that uses ARPACK as an eigensolver on (X * X. To work around this, fit instances of this class to data once, then keep the instance around to do transformations.
Words are then compared by taking the cosine of the angle between the two vectors (or the dot product between the normalizations of the two vectors) formed by any two rows.
Values close to 1 represent very similar words while values close to 0 represent very dissimilar words.
Animation of the topic detection process in a document-word matrix.