forked from p83651209/CPM-9G-8B
160 lines
5.5 KiB
Python
160 lines
5.5 KiB
Python
import os
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import random
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import bmtrain as bmt
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import numpy as np
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class BitSet:
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def __init__(self, size=1024**2):
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self.size = size
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self.bitset = np.zeros(self.size, dtype=bool)
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def _ensure_capacity(self, num):
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"""确保bitset有足够的容量来存储指定的数字"""
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if num >= self.size:
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# 扩展bitset大小
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new_size = max(num + 1, self.size * 2)
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new_bitset = np.zeros(new_size, dtype=bool)
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new_bitset[: self.size] = self.bitset
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self.bitset = new_bitset
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self.size = new_size
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bmt.print_rank("enlarge size to {}".format(self.size))
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def add(self, num):
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"""向bitset中添加一个数字"""
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self._ensure_capacity(num)
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self.bitset[num] = True
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def remove(self, num):
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"""从bitset中移除一个数字"""
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if num < self.size:
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self.bitset[num] = False
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def contains(self, num):
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"""检查bitset是否包含某个数字"""
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return num < self.size and self.bitset[num]
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def __contains__(self, num):
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return self.contains(num)
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def update(self, iterable_or_bitset):
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"""使用可迭代对象或另一个BitSet中的元素更新当前bitset"""
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if isinstance(iterable_or_bitset, BitSet):
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# 如果参数是BitSet，则使用numpy的向量化操作更新
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self._ensure_capacity(iterable_or_bitset.size)
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self.bitset[: iterable_or_bitset.size] |= iterable_or_bitset.bitset
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else:
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# 如果参数是可迭代对象，则遍历并添加每个元素
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for num in iterable_or_bitset:
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self.add(num)
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def __sub__(self, other):
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"""实现减法运算符，使用numpy向量化操作来高效地创建一个新的bitset"""
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# 创建一个新的bitset实例
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result = BitSet(max(self.size, other.size))
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# 使用numpy的向量化逻辑运算
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result.bitset[: self.size] = self.bitset & ~other.bitset[: self.size]
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return result
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def __isub__(self, other):
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"""实现就地减法运算符，利用numpy向量化操作进行高效的元素移除"""
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# 首先确保other的大小不超过当前bitset的大小
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min_size = min(self.size, other.size)
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# 使用numpy的向量化逻辑运算进行元素移除
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self.bitset[:min_size] &= ~other.bitset[:min_size]
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return self
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def __str__(self):
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"""返回bitset的字符串表示，列出所有为真的位的索引"""
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# 找出所有为真的位的索引
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true_indices = np.where(self.bitset)[0]
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# 将这些索引转换为字符串并用逗号分隔
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indices_str = ", ".join(map(str, true_indices))
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return f"BitSet({indices_str})"
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def __len__(self):
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"""返回bitset中为真的元素个数"""
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return self.bitset.sum()
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def capacity(self):
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return self.size
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def density(self):
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return len(self) / self.size
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def memory_usage(self):
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"""返回bitset所占用的内存大小，以KB、MB或GB为单位"""
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bytes_usage = self.bitset.nbytes
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if bytes_usage < 1024:
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return f"{bytes_usage} B"
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elif bytes_usage < 1024**2:
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return f"{bytes_usage / 1024:.2f} KB"
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elif bytes_usage < 1024**3:
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return f"{bytes_usage / 1024**2:.2f} MB"
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else:
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return f"{bytes_usage / 1024**3:.2f} GB"
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def to_list(self):
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"""返回一个包含所有为真位索引的列表"""
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return list(np.where(self.bitset)[0])
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def save(self, filename):
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"""将bitset保存到文件"""
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def random_hash():
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"""返回一个随机哈希值"""
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return random.randint(0, 2**64 - 1)
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filename_with_suffix = filename + ".{}.npy".format(random_hash())
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dirname = os.path.dirname(filename_with_suffix)
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os.makedirs(dirname, exist_ok=True)
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np.save(filename_with_suffix, self.bitset)
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return os.path.basename(filename_with_suffix) # 返回最后的名字，不带前缀，支持tranfer项目
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@classmethod
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def load(cls, filename_with_suffix):
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"""从文件加载bitset并创建一个新的BitSet实例"""
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bitset_array = np.load(filename_with_suffix)
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bitset = cls(bitset_array.size)
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bitset.bitset = bitset_array
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return bitset
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def bitset_diff(normal_set, bitset):
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"""返回存在于normal_set中但不在bitset中的元素集合"""
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ret = {elem for elem in normal_set if not bitset.contains(elem)}
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return ret
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if __name__ == "__main__":
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# 示例使用
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bitset1 = BitSet(1024)
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bitset1.update([100, 200, 300, 1023])
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bitset2 = BitSet(1024)
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bitset2.update([100, 400, 1023])
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result_bitset = bitset1 - bitset2
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print(100 in result_bitset) # 应该输出False
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print(200 in result_bitset) # 应该输出True
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print(300 in result_bitset) # 应该输出True
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print(1023 in result_bitset) # 应该输出False
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bitset1 -= bitset2
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print(result_bitset) # BitSet(200, 300)
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print(bitset1) # BitSet(200, 300)
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print(bitset2) # BitSet(100, 400, 1023)
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bitsetlarge = BitSet(1024**3)
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print(len(bitsetlarge), bitsetlarge.capacity(), bitsetlarge.density(), bitset1.density())
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print("BitSet memory usage:", bitsetlarge.memory_usage())
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print(bitset_diff({100, 200}, bitset2))
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bitset1.update(bitset2)
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bitsetlarge.add(52260134)
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bitset2.update(bitsetlarge)
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print(bitset1) # BitSet(100, 200, 300, 400, 1023)
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print(bitset2) # BitSet(100, 400, 1023, 52260134)
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