| import os |
| import copy |
| import numpy as np |
|
|
| from utils.mpr import MultipleProcessRunnerSimplifier |
|
|
|
|
| |
| class FileReader: |
| @classmethod |
| |
| def build_pointer(cls, file_path, save_path): |
| with open(file_path, 'r') as r: |
| loc = r.tell() |
| line = r.readline() |
| |
| |
| cnt = 0 |
| loc_array = [] |
| while line: |
| loc_array.append(loc) |
| loc = r.tell() |
| line = r.readline() |
|
|
| cnt += 1 |
| if cnt % 100000 == 0: |
| print(f"\rAlready loaded {cnt} rows", end='', flush=True) |
| |
| loc_array = np.array(loc_array) |
| np.save(save_path, loc_array) |
|
|
| def __init__(self, file_path): |
| |
| pointer_path = f"{file_path}.pointer.npy" |
| if not os.path.exists(pointer_path): |
| FileReader.build_pointer(file_path, pointer_path) |
|
|
| self.file = open(file_path, 'r') |
| |
| |
| |
| |
| self.pointer = np.load(pointer_path) |
|
|
| |
| def get(self, index): |
| loc = self.pointer[index] |
| self.file.seek(loc) |
| return self.file.readline()[:-1] |
|
|
| def __len__(self): |
| return len(self.pointer) |
| |
| |
| def get_file_readers(file_path: str, n_readers: int) -> list: |
| """ |
| This function is used to read large file by using multiple readers |
| Args: |
| file_path: path to file |
| n_readers: number of readers |
| |
| Returns: a list of file readers |
| |
| """ |
| reader = FileReader(file_path) |
| reader.file.close() |
| reader_list = [] |
| for i in range(n_readers): |
| tmp = copy.copy(reader) |
| tmp.file = open(file_path, "r") |
| reader_list.append(tmp) |
| |
| return reader_list |
|
|
