Re-add BB module

src/BB/log.jl

@@ -0,0 +1,68 @@
+#  MIPLearn: Extensible Framework for Learning-Enhanced Mixed-Integer Optimization
+#  Copyright (C) 2020, UChicago Argonne, LLC. All rights reserved.
+#  Released under the modified BSD license. See COPYING.md for more details.
+
+using Printf
+
+function print_progress_header()
+    @printf(
+        "%8s %9s %9s %13s %13s %9s %6s %13s %6s %-24s %9s %9s %6s %6s",
+        "time",
+        "processed",
+        "pending",
+        "primal-bound",
+        "dual-bound",
+        "gap",
+        "node",
+        "obj",
+        "parent",
+        "branch-var",
+        "branch-lb",
+        "branch-ub",
+        "depth",
+        "iinfes"
+    )
+    println()
+    flush(stdout)
+end
+
+function print_progress(
+    pool::NodePool,
+    node::Node;
+    time_elapsed::Float64,
+    print_interval::Int,
+    primal_update::Bool,
+)::Nothing
+    if (pool.processed % print_interval == 0) || isempty(pool.pending) || primal_update
+        if isempty(node.branch_vars)
+            branch_var_name = "---"
+            branch_lb = "---"
+            branch_ub = "---"
+        else
+            branch_var_name = name(node.mip, last(node.branch_vars))
+            L = min(24, length(branch_var_name))
+            branch_var_name = branch_var_name[1:L]
+            branch_lb = @sprintf("%9.2f", last(node.branch_lb))
+            branch_ub = @sprintf("%9.2f", last(node.branch_ub))
+        end
+        @printf(
+            "%8.2f %9d %9d %13.6e %13.6e %9.2e %6d %13.6e %6s %-24s %9s %9s %6d %6d",
+            time_elapsed,
+            pool.processed,
+            length(pool.processing) + length(pool.pending),
+            pool.primal_bound * node.mip.sense,
+            pool.dual_bound * node.mip.sense,
+            pool.gap,
+            node.index,
+            node.obj * node.mip.sense,
+            node.parent === nothing ? "---" : @sprintf("%d", node.parent.index),
+            branch_var_name,
+            branch_lb,
+            branch_ub,
+            length(node.branch_vars),
+            length(node.fractional_variables)
+        )
+        println()
+        flush(stdout)
+    end
+end