解释这段代码def get_cs_with_support_from_occurrences(candidate_set_list: [], number_of_subjects: int) -> []:

这段代码定义了一个名为get_cs_with_support_from_occurrences的函数，该函数接受两个参数：一个候选项集列表（candidate_set_list）和一个整数类型的主体数量（number_of_subjects），并返回一个列表。

参数candidate_set_list是一个包含多个候选项集的列表，每个候选项集都是一个由多个项组成的集合。

参数number_of_subjects表示主体数量，即该数据集中的实体数。

函数通过遍历候选项集列表，计算每个候选项集在数据集中出现的次数，并计算其支持度（即出现次数除以主体数量）。最后，将支持度大于0的候选项集及其支持度存储在一个列表中，并返回该列表作为函数的输出。

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def get_cs_with_support_from_occurrences(candidate_set_list: [], number_of_subjects: int) -> []:

frequent_itemsets = []
for candidate_set in candidate_set_list:
support = 0
for subject in range(number_of_subjects):
if all(item in subject for item in candidate_set):
support += 1
if support/number_of_subjects >= 0.5:
frequent_itemsets.append((candidate_set, support/number_of_subjects))
return frequent_itemsets

def get_occurrences_of_sequence(original_dataset: [], checked_sequence: ()) -> []:

# function definition
def get_occurrences_of_sequence(original_dataset: [], checked_sequence: ()) -> []:
"""
This function takes in two parameters:
1. original_dataset: a list of tuples containing sequences of integers
2. checked_sequence: a tuple containing sequence of integers to be searched in the original_dataset

The function returns a list of tuples containing the index of the sequence in the original_dataset and the number of times the checked_sequence occurs in that sequence.
If the checked_sequence is not found in any of the sequences in the original_dataset, the function returns an empty list.
"""
occurrences_list = []
for i, sequence in enumerate(original_dataset):
# check if checked_sequence is a sub-sequence of sequence
if checked_sequence in [sequence[j:j+len(checked_sequence)] for j in range(len(sequence)-len(checked_sequence)+1)]:
# count the number of times checked_sequence occurs in sequence
count = sequence.count(checked_sequence)
# store the index of the sequence and the count of checked_sequence in a tuple
occurrences_list.append((i, count))
return occurrences_list