With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Robert Duvall is a person who acts.
text_B: A Gaussian random field -LRB- GRF -RRB- is a random field involving Gaussian probability density functions of the variables .. random field. random field. Gaussian probability density functions. multivariate normal distribution. A one-dimensional GRF is also called a Gaussian process .. Gaussian process. Gaussian process. An important special case of a GRF is the Gaussian free field .. Gaussian free field. Gaussian free field. With regard to applications of GRFs , the initial conditions of physical cosmology generated by quantum mechanical fluctuations during cosmic inflation are thought to be a GRF with a nearly scale invariant spectrum .. physical cosmology. physical cosmology. quantum mechanical fluctuations. quantum fluctuation. cosmic inflation. cosmic inflation. scale invariant. scale invariant
not_related.