将字典写入 csv 文件，其中两个项目彼此相邻，而不是在 python 中彼此下方

Question

I think this is a simple question but I have been looking for so long and havent found a solution to my problem.

so I have a function that is being called multiple times(objective function in my code). Each time a set of parameters are choosen and the time of running my code is calculated. Now I want to write the set of parameters together with their belonging time value into a csv file.

The parameters are stored in a list and the value is a simple float. Toegether I store them in a dictionary. Now when I write them to the csv file, I want the parameters to be stored in one cell and the belonging time value in the cell next to it. It will make it easy for me to sort by value and find the parameters that led to the highest time values. (Ideally the different parameters are stored in seperated cells as well but that is not that important)

So I what I want would look like this:

Parameters	Time
1,2,3	1 s
10,20,30	2 s

Or even better would be:

Parameter A	Parameter B	Parameter c	Time
1	2	3	1s
10	20	30	2s

What I have now is this:

Parameters	Another header
1,2,3	-
-	-
1s	-
-	-
10,20,30	-
-	-
2s	-
-	-

My Code now is looking like this:

def objective(trial):

    start = time.perf_counter
    
    # Here some Parameters are choosen 

    # Here happens some calculations

    end = time.perf_counter()

    duration = end-start

    params_csv=[batch_size,model_type,n_layers,n_hidden,weight_decay,dropout,lr,eta_min,T0,T_mult]
    dict_csv = {"Params": params_csv,"Time": duration} 

    out_file = 'optuna_time_trials_9.csv'
    of_connection = open(out_file, 'a')
    writer_params = csv.writer(of_connection)

    for key, value in dict_csv.items():
        writer_params.writerow([key, value])
    return foo

study = optuna.create_study(direction='minimize',study_name='Optuna_Parameter_Time_11', storage='sqlite:///example2.db', load_if_exists=True )
study.optimize(objective, n_trials=15)

Answer 1

You should just use the list of parameters as the list to write with writerow() . And add duration to the end of the list to add that column to the CSV.

There's no need for the dictionary.

def objective(trial):

    start = time.perf_counter
    
    # Here some Parameters are choosen 

    # Here happens some calculations

    end = time.perf_counter()

    duration = end-start

    out_file = 'optuna_time_trials_9.csv'
    with open(out_file, 'a') as of_connection:
        writer_params = csv.writer(of_connection)
        writer_params.writerow([batch_size,model_type,n_layers,n_hidden,weight_decay,dropout,lr,eta_min,T0,T_mult,duration]