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From 1435ef74f7750230973390520368dd0af65888a0 Mon Sep 17 00:00:00 2001
From: Nilesh Patra <nilesh@riseup.net>
Date: Sun, 27 Apr 2025 12:52:34 +0530
Subject: [PATCH] Prevent alpha from underflowing
---
include/cppoptlib/linesearch/armijo.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/include/cppoptlib/linesearch/armijo.h
+++ b/include/cppoptlib/linesearch/armijo.h
@@ -29,8 +29,9 @@
TVector grad(x.rows());
objFunc.gradient(x, grad);
const Scalar Cache = c * grad.dot(searchDir);
+ const Scalar alpha_min = 1e-8;
- while(f > f_in + alpha * Cache) {
+ while(f > f_in + alpha * Cache && alpha > alpha_min) {
alpha *= rho;
f = objFunc.value(x + alpha * searchDir);
}
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