Add weights handling (experimental)

[morpheus.git] / pkg / R / optimParams.R

diff --git a/pkg/R/optimParams.R b/pkg/R/optimParams.R
index 2eada8f..4f886ac 100644 (file)
--- a/pkg/R/optimParams.R
+++ b/pkg/R/optimParams.R
@@ -10,6 +10,7 @@
 #'     \item 'M' : list of moments of order 1,2,3: will be computed if not provided.
 #'     \item 'X,Y' : input/output, mandatory if moments not given
 #'     \item 'exact': use exact formulas when available?
+#'     \item weights Weights on moments when minimizing sum of squares
 #'   }
 #'
 #' @return An object 'op' of class OptimParams, initialized so that \code{op$run(x0)}
@@ -56,9 +57,14 @@ optimParams = function(K, link=c("logit","probit"), optargs=list())
                M <- computeMoments(optargs$X,optargs$Y)
        }
 
+  weights <- optargs$weights
+  if (is.null(weights))
+    weights <- rep(1, K)
+
        # Build and return optimization algorithm object
        methods::new("OptimParams", "li"=link, "M1"=as.double(M[[1]]),
-               "M2"=as.double(M[[2]]), "M3"=as.double(M[[3]]), "K"=as.integer(K))
+               "M2"=as.double(M[[2]]), "M3"=as.double(M[[3]]),
+    "weights"=weights, "K"=as.integer(K))
 }
 
 # Encapsulated optimization for p (proportions), β and b (regression parameters)
@@ -67,6 +73,7 @@ optimParams = function(K, link=c("logit","probit"), optargs=list())
 # @field M1 Estimated first-order moment
 # @field M2 Estimated second-order moment (flattened)
 # @field M3 Estimated third-order moment (flattened)
+# @field weights Vector of moments' weights
 # @field K Number of populations
 # @field d Number of dimensions
 #
@@ -132,9 +139,9 @@ setRefClass(
                        β3 <- apply(β, 2, function(col) col %o% col %o% col)
 
                        return(
-                               sum( ( β  %*% (p * .G(li,1,λ,b)) - M1 )^2 ) +
-                               sum( ( β2 %*% (p * .G(li,2,λ,b)) - M2 )^2 ) +
-                               sum( ( β3 %*% (p * .G(li,3,λ,b)) - M3 )^2 ) )
+                               weights[1] * sum( ( β  %*% (p * .G(li,1,λ,b)) - M1 )^2 ) +
+                               weights[2] * sum( ( β2 %*% (p * .G(li,2,λ,b)) - M2 )^2 ) +
+                               weights[3] * sum( ( β3 %*% (p * .G(li,3,λ,b)) - M3 )^2 ) )
                },
 
                grad_f = function(x)
@@ -166,9 +173,9 @@ setRefClass(
 
                        km1 = 1:(K-1)
                        grad <- #gradient on p
-                               t( sweep(as.matrix(β [,km1]), 2, G1[km1], '*') - G1[K] * β [,K] ) %*% F1 +
-                               t( sweep(as.matrix(β2[,km1]), 2, G2[km1], '*') - G2[K] * β2[,K] ) %*% F2 +
-                               t( sweep(as.matrix(β3[,km1]), 2, G3[km1], '*') - G3[K] * β3[,K] ) %*% F3
+                               weights[1] * t( sweep(as.matrix(β [,km1]), 2, G1[km1], '*') - G1[K] * β [,K] ) %*% F1 +
+                               weights[2] * t( sweep(as.matrix(β2[,km1]), 2, G2[km1], '*') - G2[K] * β2[,K] ) %*% F2 +
+                               weights[3] * t( sweep(as.matrix(β3[,km1]), 2, G3[km1], '*') - G3[K] * β3[,K] ) %*% F3
 
                        grad_β <- matrix(nrow=d, ncol=K)
                        for (i in 1:d)
@@ -197,14 +204,17 @@ setRefClass(
                                dβ3_right[block,] <- dβ3_right[block,] + β2
                                dβ3 <- dβ3_left + sweep(dβ3_right, 2, p * G3, '*')
 
-                               grad_β[i,] <- t(dβ) %*% F1 + t(dβ2) %*% F2 + t(dβ3) %*% F3
+                               grad_β[i,] <-
+          weights[1] * t(dβ) %*% F1 +
+          weights[2] * t(dβ2) %*% F2 +
+          weights[3] * t(dβ3) %*% F3
                        }
                        grad <- c(grad, as.double(grad_β))
 
                        grad = c(grad, #gradient on b
-                               t( sweep(β,  2, p * G2, '*') ) %*% F1 +
-                               t( sweep(β2, 2, p * G3, '*') ) %*% F2 +
-                               t( sweep(β3, 2, p * G4, '*') ) %*% F3 )
+                               weights[1] * t( sweep(β,  2, p * G2, '*') ) %*% F1 +
+                               weights[2] * t( sweep(β2, 2, p * G3, '*') ) %*% F2 +
+                               weights[3] * t( sweep(β3, 2, p * G4, '*') ) %*% F3 )
 
                        grad
                },