Fix MIP solver variable duplication and function structure
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dmy
146
test_cbc_solver.py
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146
test_cbc_solver.py
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"""
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Simple test to verify CBC solver functionality
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"""
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import pulp
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import sys
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import subprocess
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import os
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print("=== PuLP and CBC Solver Test ===")
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print(f"Python version: {sys.version}")
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print(f"PuLP version: {pulp.__version__}")
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# Test 1: Check PuLP installation
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print("\n1. Checking PuLP installation...")
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try:
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from pulp import LpProblem, LpVariable, LpMinimize, LpMaximize, lpSum, value
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print("[OK] PuLP imported successfully")
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except ImportError as e:
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print(f"[FAIL] PuLP import failed: {e}")
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sys.exit(1)
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# Test 2: Check CBC solver file existence
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print("\n2. Checking CBC solver file...")
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solver_dir = os.path.join(
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os.path.dirname(pulp.__file__), "apis", "..", "solverdir", "cbc", "win", "i64"
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)
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solver_path = os.path.join(solver_dir, "cbc.exe")
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print(f"Looking for CBC at: {solver_path}")
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if os.path.exists(solver_path):
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print(f"[OK] CBC solver file found")
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file_size = os.path.getsize(solver_path)
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print(f" File size: {file_size:,} bytes ({file_size / 1024 / 1024:.2f} MB)")
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else:
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print(f"[FAIL] CBC solver file not found")
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print(f" Checking directory contents:")
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try:
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parent_dir = os.path.dirname(solver_path)
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if os.path.exists(parent_dir):
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for item in os.listdir(parent_dir):
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print(f" - {item}")
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else:
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print(f" Directory does not exist: {parent_dir}")
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except Exception as e:
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print(f" Error listing directory: {e}")
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# Test 3: Try to run CBC solver directly
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print("\n3. Testing CBC solver execution...")
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if os.path.exists(solver_path):
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try:
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result = subprocess.run(
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[solver_path, "-version"],
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capture_output=True,
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text=True,
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timeout=10,
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check=True,
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)
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print("[OK] CBC solver executed successfully")
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print(f" Output: {result.stdout[:200]}")
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except subprocess.CalledProcessError as e:
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print(f"[FAIL] CBC solver execution failed (exit code {e.returncode})")
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print(f" stdout: {e.stdout[:200]}")
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print(f" stderr: {e.stderr[:200]}")
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except subprocess.TimeoutExpired:
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print("[FAIL] CBC solver execution timed out")
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except Exception as e:
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print(f"[FAIL] CBC solver execution error: {e}")
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else:
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print("[FAIL] Cannot test CBC execution - file not found")
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# Test 4: Solve a simple linear programming problem
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print("\n4. Testing simple LP problem...")
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try:
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# Simple problem: minimize x + y subject to x + y >= 5, x >= 0, y >= 0
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prob = LpProblem("Simple_LP_Test", LpMinimize)
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x = LpVariable("x", lowBound=0, cat="Continuous")
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y = LpVariable("y", lowBound=0, cat="Continuous")
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prob += x + y # Objective: minimize x + y
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prob += x + y >= 5 # Constraint
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print(" Created simple LP problem: minimize x + y subject to x + y >= 5")
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# Try to solve with CBC
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solver = pulp.PULP_CBC_CMD(msg=False, timeLimit=10)
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print(" Attempting to solve with CBC...")
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status = prob.solve(solver)
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print(f"[OK] LP problem solved")
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print(f" Status: {pulp.LpStatus[prob.status]}")
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print(f" Objective value: {value(prob.objective)}")
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print(f" x = {value(x)}, y = {value(y)}")
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if abs(value(prob.objective) - 5.0) < 0.01:
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print(" [OK] Correct solution found!")
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else:
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print(f" [FAIL] Unexpected solution (expected 5.0)")
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except Exception as e:
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print(f"[FAIL] LP problem solving failed: {e}")
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import traceback
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traceback.print_exc()
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# Test 5: Solve a simple mixed integer programming problem
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print("\n5. Testing simple MIP problem...")
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try:
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# Simple MIP: minimize x + y subject to x + y >= 5, x, y integers >= 0
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prob = LpProblem("Simple_MIP_Test", LpMinimize)
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x = LpVariable("x", lowBound=0, cat="Integer")
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y = LpVariable("y", lowBound=0, cat="Integer")
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prob += x + y # Objective
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prob += x + y >= 5 # Constraint
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print(
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" Created simple MIP problem: minimize x + y subject to x + y >= 5, x,y integers"
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)
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solver = pulp.PULP_CBC_CMD(msg=False, timeLimit=10)
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print(" Attempting to solve with CBC...")
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status = prob.solve(solver)
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print(f"[OK] MIP problem solved")
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print(f" Status: {pulp.LpStatus[prob.status]}")
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print(f" Objective value: {value(prob.objective)}")
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print(f" x = {value(x)}, y = {value(y)}")
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if abs(value(prob.objective) - 5.0) < 0.01:
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print(" [OK] Correct solution found!")
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else:
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print(f" [FAIL] Unexpected solution (expected 5.0)")
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except Exception as e:
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print(f"[FAIL] MIP problem solving failed: {e}")
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import traceback
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traceback.print_exc()
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print("\n=== Test Complete ===")
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