我正在尝试使用 SparkTrials 从 hyperopt 图书馆。我在一台有16个内核的机器上运行这个程序，但是当我运行下面的代码将内核数设置为8时，我得到一个警告，似乎表明只使用了一个内核。
sparktrials接受作为论据 spark_session 从理论上讲，这就是我设定核数的地方。
有人能帮我吗？
谢谢！

import os, shutil, tempfile
from hyperopt import fmin, tpe, hp, SparkTrials, STATUS_OK
import numpy as np
from sklearn import linear_model, datasets, model_selection
import pyspark
from pyspark.sql import SparkSession

spark = SparkSession.builder.master("local").config('spark.local.dir', './').config("spark.executor.cores", 8).getOrCreate()

def gen_data(bytes):
  """
  Generates train/test data with target total bytes for a random regression problem.
  Returns (X_train, X_test, y_train, y_test).
  """
  n_features = 100
  n_samples = int(1.0 * bytes / (n_features + 1) / 8)
  X, y = datasets.make_regression(n_samples=n_samples, n_features=n_features, random_state=0)
  return model_selection.train_test_split(X, y, test_size=0.2, random_state=1)

def train_and_eval(data, alpha):
  """
  Trains a LASSO model using training data with the input alpha and evaluates it using test data.
  """
  X_train, X_test, y_train, y_test = data  
  model = linear_model.Lasso(alpha=alpha)
  model.fit(X_train, y_train)
  loss = model.score(X_test, y_test)
  return {"loss": loss, "status": STATUS_OK}

def tune_alpha(objective):
  """
  Uses Hyperopt's SparkTrials to tune the input objective, which takes alpha as input and returns loss.
  Returns the best alpha found.
  """
  best = fmin(
    fn=objective,
    space=hp.uniform("alpha", 0.0, 10.0),
    algo=tpe.suggest,
    max_evals=8,
    trials=SparkTrials(parallelism=8,spark_session=spark))
  return best["alpha"]

data_small = gen_data(10 * 1024 * 1024)  # ~10MB

def objective_small(alpha):
  # For small data, you might reference it directly.
  return train_and_eval(data_small, alpha)

tune_alpha(objective_small)

并行度（8）大于当前spark任务槽（1）的总数。如果启用了动态分配，您可能会看到分配了更多的执行器。