sumPen <- sum(pi^gamma * b)
last_llh <- llh
- llh <- -sumLogLLH/n + lambda * sumPen
+ llh <- -sumLogLLH/n #+ lambda * sumPen
dist <- ifelse(ite == 1, llh, (llh - last_llh)/(1 + abs(llh)))
Dist1 <- max((abs(phi - Phi))/(1 + abs(phi)))
Dist2 <- max((abs(rho - Rho))/(1 + abs(rho)))
#' Construct the data-driven grid for the regularization parameters used for the Lasso estimator
#'
#' @param phiInit value for phi
-#' @param rhoInit\tvalue for rho
-#' @param piInit\tvalue for pi
+#' @param rhoInit for rho
+#' @param piInit for pi
#' @param gamInit value for gamma
#' @param X matrix of covariates (of size n*p)
#' @param Y matrix of responses (of size n*m)
list_EMG <- EMGLLF(phiInit, rhoInit, piInit, gamInit, mini, maxi, gamma, lambda = 0,
X, Y, tau, fast)
grid <- array(0, dim = c(p, m, k))
- for (i in 1:p)
+ for (j in 1:p)
{
- for (j in 1:m)
- grid[i, j, ] <- abs(list_EMG$S[i, j, ])/(n * list_EMG$pi^gamma)
+ for (mm in 1:m)
+ grid[j, mm, ] <- abs(list_EMG$S[j, mm, ])/(n * list_EMG$pi^gamma)
}
sort(unique(grid))
}
phiLambda[col.sel[j], sel.lambda[[j]], ] <- phiLambda2[j, sel.lambda[[j]], ]
dimension <- length(unlist(sel.lambda))
- # Computation of the loglikelihood
- densite <- vector("double", n)
- for (r in 1:k)
+ ## Computation of the loglikelihood
+ # Precompute det(rhoLambda[,,r]) for r in 1...k
+ detRho <- sapply(1:k, function(r) det(rhoLambda[, , r]))
+ sumLogLLH <- 0
+ for (i in 1:n)
{
- if (length(col.sel) == 1)
- {
- delta <- (Y %*% rhoLambda[, , r] - (X[, col.sel] %*% t(phiLambda[col.sel, , r])))
- } else delta <- (Y %*% rhoLambda[, , r] - (X[, col.sel] %*% phiLambda[col.sel, , r]))
- densite <- densite + piLambda[r] * det(rhoLambda[, , r])/(sqrt(2 * base::pi))^m *
- exp(-diag(tcrossprod(delta))/2)
+ # Update gam[,]; use log to avoid numerical problems
+ logGam <- sapply(1:k, function(r) {
+ log(piLambda[r]) + log(detRho[r]) - 0.5 *
+ sum((Y[i, ] %*% rhoLambda[, , r] - X[i, ] %*% phiLambda[, , r])^2)
+ })
+
+ logGam <- logGam - max(logGam) #adjust without changing proportions
+ gam[i, ] <- exp(logGam)
+ norm_fact <- sum(gam[i, ])
+ gam[i, ] <- gam[i, ] / norm_fact
+ sumLogLLH <- sumLogLLH + log(norm_fact) - log((2 * base::pi)^(m/2))
}
- llhLambda <- c(sum(log(densite)), (dimension + m + 1) * k - 1)
+ llhLambda <- c(sumLogLLH/n, (dimension + m + 1) * k - 1)
+ # densite <- vector("double", n)
+ # for (r in 1:k)
+ # {
+ # if (length(col.sel) == 1)
+ # {
+ # delta <- (Y %*% rhoLambda[, , r] - (X[, col.sel] %*% t(phiLambda[col.sel, , r])))
+ # } else delta <- (Y %*% rhoLambda[, , r] - (X[, col.sel] %*% phiLambda[col.sel, , r]))
+ # densite <- densite + piLambda[r] * det(rhoLambda[, , r])/(sqrt(2 * base::pi))^m *
+ # exp(-rowSums(delta^2)/2)
+ # }
+ # llhLambda <- c(mean(log(densite)), (dimension + m + 1) * k - 1)
list(phi = phiLambda, rho = rhoLambda, pi = piLambda, llh = llhLambda)
}
#' @param ncores_outer Number of cores for the outer loop on k
#' @param ncores_inner Number of cores for the inner loop on lambda
#' @param thresh real, threshold to say a variable is relevant, by default = 1e-8
+#' @param compute_grid_lambda, TRUE to compute the grid, FALSE if known (in arguments)
+#' @param grid_lambda, a vector with regularization parameters if known, by default 0
#' @param size_coll_mod (Maximum) size of a collection of models
#' @param fast TRUE to use compiled C code, FALSE for R code only
#' @param verbose TRUE to show some execution traces
#' @export
valse <- function(X, Y, procedure = "LassoMLE", selecMod = "DDSE", gamma = 1, mini = 10,
maxi = 50, eps = 1e-04, kmin = 2, kmax = 3, rank.min = 1, rank.max = 5, ncores_outer = 1,
- ncores_inner = 1, thresh = 1e-08, size_coll_mod = 10, fast = TRUE, verbose = FALSE,
+ ncores_inner = 1, thresh = 1e-08, compute_grid_lambda = TRUE, grid_lambda = 0, size_coll_mod = 10, fast = TRUE, verbose = FALSE,
plot = TRUE)
{
p <- dim(X)[2]
# component, doing this 20 times, and keeping the values maximizing the
# likelihood after 10 iterations of the EM algorithm.
P <- initSmallEM(k, X, Y, fast)
- grid_lambda <- computeGridLambda(P$phiInit, P$rhoInit, P$piInit, P$gamInit,
- X, Y, gamma, mini, maxi, eps, fast)
+ if (compute_grid_lambda == TRUE)
+ {
+ grid_lambda <- computeGridLambda(P$phiInit, P$rhoInit, P$piInit, P$gamInit,
+ X, Y, gamma, mini, maxi, eps, fast)
+ }
if (length(grid_lambda) > size_coll_mod)
grid_lambda <- grid_lambda[seq(1, length(grid_lambda), length.out = size_coll_mod)]
complexity = sumPen, contrast = -LLH)
}))
tableauRecap <- tableauRecap[which(tableauRecap[, 4] != Inf), ]
-
+ if (verbose == TRUE)
+ {
+ print(tableauRecap)
+ }
modSel <- capushe::capushe(tableauRecap, n)
indModSel <- if (selecMod == "DDSE")
as.numeric(modSel@DDSE@model) else if (selecMod == "Djump")
Gam <- Gam/rowSums(Gam)
modelSel$affec <- apply(Gam, 1, which.max)
modelSel$proba <- Gam
+ modelSel$tableau <- tableauRecap
if (plot)
print(plot_valse(X, Y, modelSel, n))
#'
#' @param phiInit an initial estimator for phi (size: p*m*k)
#' @param rhoInit an initial estimator for rho (size: m*m*k)
-#' @param piInit\tan initial estimator for pi (size : k)
+#' @param piInit an initial estimator for pi (size : k)
#' @param gamInit an initial estimator for gamma
-#' @param mini\t\tminimum number of iterations in EM algorithm
-#' @param maxi\t\tmaximum number of iterations in EM algorithm
-#' @param gamma\t power in the penalty
+#' @param mini minimum number of iterations in EM algorithm
+#' @param maxi maximum number of iterations in EM algorithm
+#' @param gamma power in the penalty
#' @param glambda grid of regularization parameters
-#' @param X\t\t\t matrix of regressors
-#' @param Y\t\t\t matrix of responses
+#' @param X matrix of regressors
+#' @param Y matrix of responses
#' @param thresh real, threshold to say a variable is relevant, by default = 1e-8
-#' @param eps\t\t threshold to say that EM algorithm has converged
+#' @param eps threshold to say that EM algorithm has converged
#' @param ncores Number or cores for parallel execution (1 to disable)
#'
#' @return a list of outputs, for each lambda in grid: selected,Rho,Pi
--- /dev/null
+m=11
+p=10
+
+covY = array(0,dim = c(m,m,2))
+covY[,,1] = diag(m)
+covY[,,2] = diag(m)
+
+Beta = array(0, dim = c(p, p, 2))
+Beta[1:4,1:4,1] = 3*diag(4)
+Beta[1:4,1:4,2] = -2*diag(4)
+
+Data = generateXY(100, c(0.5,0.5), rep(0,p), Beta, diag(m), covY)
projects / valse.git / commitdiff
