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Lwich's questions

Martin Hope
Lwich
Asked: 2024-02-17 19:12:24 +0800 CST
  • 6

不起作用QScrollArea，基本上不会出现。

帮助我理解为什么它不起作用？

import sys
import asyncio
from PyQt6.QtCore import QSize, Qt, QRect
from PyQt6.QtWidgets import QApplication, QMainWindow, QHBoxLayout, \
    QWidget, QVBoxLayout, QPushButton, QLineEdit, QScrollArea, QLabel, \ 
    QGridLayout
from parser.db import get_data_by_condition


class Window(QMainWindow):
    def __init__(self) -> None:
        super().__init__()
        self.init_ui()
    
    def init_ui(self):
        self.add_button = QPushButton('Добавить')
        self.add_button.clicked.connect(self.parse_data)

        self.model = QLineEdit()
        self.detail = QLineEdit()
        self.article = QLineEdit()

        input_layout = QHBoxLayout()
        input_layout.setSpacing(12)
        input_layout.addWidget(self.add_button)
        input_layout.addWidget(self.model)
        input_layout.addWidget(self.detail)
        input_layout.addWidget(self.article)

        input_widget = QWidget()
        input_widget.setLayout(input_layout)

        layout = QVBoxLayout()

        container = QWidget()
        self.scroll_layout = QVBoxLayout(container)
        self.scroll_layout.addWidget(input_widget)
        self.scroll_area = QScrollArea(container)
        self.scroll_area.resize(900, 250)
        self.scroll_area.setWidgetResizable(True)
        self.scroll_widget = QWidget()
        self.scroll_widget.setGeometry(QRect(0, 0, 380, 280))
        self.scroll_layout_2 = QVBoxLayout(self.scroll_area)
        self.grid_layout = QGridLayout()
        self.scroll_layout_2.addLayout(self.grid_layout)
        self.scroll_area.setWidget(self.scroll_widget)
        self.scroll_layout.addWidget(self.scroll_area)

        container.setLayout(layout)
        self.setCentralWidget(container)
    
    def parse_data(self):
        model = self.model.text()
        article = self.article.text()
        detail = self.detail.text()

        loop = asyncio.new_event_loop()
        objects = loop.run_until_complete(get_data_by_condition(article, detail))
        loop.close()
        
        for obj in objects[:40]:
            label = QLabel(f'{obj[0]} {obj[1]} {obj[2]} {obj[3]} {obj[4]} {obj[5]}')
            label.setFixedHeight(20)
            self.grid_layout.addWidget(label) 


app = QApplication(sys.argv)

loop = asyncio.new_event_loop()
asyncio.set_event_loop(loop)

window = Window()
window.setFixedSize(QSize(900, 400))
window.show()

if __name__ == '__main__':
    app.exec()

在此输入图像描述

python
Martin Hope
Lwich
Asked: 2023-12-12 20:05:32 +0800 CST
  • 5

我刚刚开始研究神经网络。在解决XOR问题时，我遇到了一个总是给我0.5的问题

import random


def sigmoid(x):
    return 1 / (1 + math.exp(-x))

def dot(l1, l2):
    s = 0
    for i in range(len(l1)):
        s += l1[i] * l2[i]
    return s 


INPUTS = [[0, 0], [1, 1], [0, 1], [1, 0]]
OUTPUT = [0, 0, 1, 1]

weights = [random.random(), random.random()]

for _ in range(10_000):
    for i in range(len(INPUTS)):
        layer_input = INPUTS[i]
        output = sigmoid(dot(layer_input, weights))
        err = OUTPUT[i] - output
        delta = err * (output * (1 - output))
        grad1 = layer_input[0] * delta 
        grad2 = layer_input[1] * delta
        weights[0] += grad1 
        weights[1] += grad2 

print(sigmoid(dot([0, 0], weights))) # 0.5

尝试使用 numpy，同样的事情

python