stackは遅い

GPT-4.icon

code:py

import numpy as np

import time

# Initialize variables

shape = (100, 100)

n_iterations = 1000

# Using Python list and then convert it to ndarray

list_method_start_time = time.time()

list_of_arrays = []

for _ in range(n_iterations):

array = np.random.rand(*shape)

list_of_arrays.append(array)

concatenated_array = np.concatenate(list_of_arrays, axis=0)

list_method_end_time = time.time()

list_method_time = list_method_end_time - list_method_start_time

# Using numpy stack

stack_method_start_time = time.time()

for _ in range(n_iterations):

array = np.random.rand(*shape)

stack_of_arrays = np.vstack((stack_of_arrays, array))

stack_method_end_time = time.time()

stack_method_time = stack_method_end_time - stack_method_start_time

list_method_time, stack_method_time

code:result

(0.42954111099243164, 56.57924294471741)