# Decision Optimization

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## How to obtain nodes count and nodes left in docplex (using CPLEX 12.20 and Python 3.8)

• #### 1.  How to obtain nodes count and nodes left in docplex (using CPLEX 12.20 and Python 3.8)

Posted Fri September 29, 2023 12:56 AM
Hello everyone,

I solving a MILP problem as given below using Python 3.8 and CPLEX 12.20. I want to obtain the number of nodes and nodes left. The details of the codes are as follows:

-------------------------------------------------------------------------------
n_xvars=2
n_yvars=2

#Create model:
my_MILP=Model(name='MILP example')

# Defining variables:
x_vars={i+1:my_MILP.continuous_var(name='x_{}'.format(i+1),lb=-20,ub=20) for i in range(n_xvars)}

y_vars={i+1:my_MILP.integer_var(name='y_{}'.format(i+1),lb=-20,ub=20) for i in range(n_yvars)}

# Defining objective function:
obj=x_vars[1]+5*x_vars[2]+6*y_vars[1]-2*y_vars[2]
my_MILP.minimize(obj)

# Model information
my_MILP.print_information()
print(my_MILP.export_as_lp_string())

# Solving and solution
my_MILP.solve()
my_MILP.print_solution()

------------------------------------------------------------------------------------

I have used a few codes such as

nd_count=my_MILP.get_solve_details().nodes_processed
nd_left=my_MILP.get_solve_details().nodes_left

but I am getting errors like

AttributeError: 'SolveDetails' object has no attribute 'nodes_left'
AttributeError: 'SolveDetails' object has no attribute 'nodes_processed'

I request the community to please help me obtain the node count and nodes left for MILP, IP, etc.

Thanks