| name | run2_parallel-processing |
| description | Advanced usage of joblib for parallel execution of grid search tasks, including result flattening. |
Parallel Processing with Joblib (Advanced)
When running grid searches where each worker computes multiple results, Joblib returns a list of lists. You can easily flatten this to create a DataFrame.
Installation
Ensure you have joblib and pandas installed:
pip install joblib pandas
Usage
import pandas as pd
from joblib import Parallel, delayed
import itertools
def evaluate_subset(param_group):
results = []
for param in param_group:
results.append({'param': param, 'score': param * 2})
return results
param_groups = [[1, 2], [3, 4], [5, 6]]
all_results = Parallel(n_jobs=-1)(
delayed(evaluate_subset)(group) for group in param_groups
)
flat_results = [item for sublist in all_results for item in sublist]
df = pd.DataFrame(flat_results)