使用MVC设计模式时如何加载重模型 [英] How to load a heavy model when using MVC design pattern

问题描述

我正在使用wxPython和使用Tensorflow创建的深度学习模型构建应用程序。我正在使用的设计模式是MVC。
我的问题是深度学习模型非常繁重，需要很长时间才能加载（例如〜2分钟），同时GUI挂起。
我创建了描述该过程的示例代码。
这是加载时GUI的外观：

I'm building an application with wxPython and a Deep Learning model that I created using Tensorflow. The design pattern that I'm using is MVC. My problem is that the deep learning model is very heavy and it takes a very long time to load (like ~2 minutes) and in the meantime the GUI hangs. I created a sample code that describes the process. Here is what the GUI looks like while loading:

在此处输入图片描述

这是加载后GUI的样子：
在此处输入图片描述

and this is what the GUI looks like after the loading: enter image description here

问题是如何在模型加载时运行应用程序？
我还想在GUI中添加一条状态行，以指示该模型正在加载或已经加载。

The question is how do I get the application to run while the model is loading? I would also like to add a status line to the GUI indicating that the model is loading or already loaded.

我正在添加示例代码，该代码显示

I'm adding the sample code that shows how my application is built.

import wx
import time

class Model:
    def __init__(self):
        '''This part is simulating the loading of tensorflow'''
        x = 0
        while x < 15:
            time.sleep(1)
            print(x)
            x += 1

class View(wx.Frame):
    def __init__(self, parent, title):
        super(View, self).__init__(parent, title=title, size=(400, 400))
        self.InitUI()

    def InitUI(self):
        # Defines the GUI controls
        masterPanel = wx.Panel(self)
        masterPanel.SetBackgroundColour("gold")
        self.vbox = wx.BoxSizer(wx.VERTICAL)
        self.fgs = wx.FlexGridSizer(6, 2, 10, 25)
        id = wx.StaticText(self, label="ID:")
        firstName = wx.StaticText(self, label="First name:")
        lastName = wx.StaticText(self, label="Last name:")
        self.idTc = wx.TextCtrl(self)
        self.firstNameTc = wx.TextCtrl(self)
        self.lastNameTc = wx.TextCtrl(self)
        self.fgs.AddMany([id, (self.idTc, 1, wx.EXPAND),
                         firstName, (self.firstNameTc, 1, wx.EXPAND),
                         lastName, (self.lastNameTc, 1, wx.EXPAND)])
        self.vbox.Add(self.fgs, proportion=1, flag=wx.ALL | wx.EXPAND,
   border=15)
        self.SetSizer(self.vbox)
        self.vbox.Fit(self)
        self.Layout()

class Controller:
    def __init__(self):
        self.view = View(None, title='Test')
        self.view.Show()
        self.model = Model()

def main():
    app = wx.App()
    controller = Controller()
    app.MainLoop()

if __name__ == '__main__':
    main()

推荐答案

您应该在 self.view.Show（）之后调用 wx.GetApp（）。Yield（） 命令，该命令将控制权暂时释放给 MainLoop 。

如果模型加载代码是递增执行的，则可以调用

下面是一种简单的方法，用于通知用户发生了一些事情。如果想要取消模型加载的选项，则必须将其包装在对话框中，并假设它是增量加载的。

You should call wx.GetApp().Yield() after the self.view.Show() command, which releases control momentarily to the MainLoop.
If the model load code is performed in increments, you can call Yield periodically during the load as well.
Below is a simple method of informing the user that something is going on. If you wanted the option of cancelling the model load, you would have to wrap it in a dialog, assuming that it is loaded incrementally.

import wx
import time

class Model:
    def __init__(self):
        '''This part is simulating the loading of tensorflow'''
        x = 0
        #If the model load is perform in increments you could call wx.Yield
        # between the increments.
        while x < 15:
            time.sleep(1)
            wx.GetApp().Yield()
            print(x)
            x += 1

class View(wx.Frame):
    def __init__(self, parent, title):
        super(View, self).__init__(parent, title=title, size=(400, 400))
        self.InitUI()

    def InitUI(self):
        # Defines the GUI controls
        #masterPanel = wx.Panel(self)
        #masterPanel.SetBackgroundColour("gold")
        self.vbox = wx.BoxSizer(wx.VERTICAL)
        self.fgs = wx.FlexGridSizer(6, 2, 10, 25)
        id = wx.StaticText(self, label="ID:")
        firstName = wx.StaticText(self, label="First name:")
        lastName = wx.StaticText(self, label="Last name:")
        self.idTc = wx.TextCtrl(self)
        self.firstNameTc = wx.TextCtrl(self)
        self.lastNameTc = wx.TextCtrl(self)
        self.fgs.AddMany([id, (self.idTc, 1, wx.EXPAND),
                         firstName, (self.firstNameTc, 1, wx.EXPAND),
                         lastName, (self.lastNameTc, 1, wx.EXPAND)])
        self.vbox.Add(self.fgs, proportion=1, flag=wx.ALL | wx.EXPAND,
   border=15)
        self.CreateStatusBar() # A Statusbar in the bottom of the window
        self.StatusBar.SetStatusText("No model loaded", 0)
        self.SetSizer(self.vbox)
        self.vbox.Fit(self)
        self.Layout()

class Controller:
    def __init__(self):
        self.view = View(None, title='Test')
        self.view.Show()
        self.view.SetStatusText("Model loading", 0)
        wait = wx.BusyInfo("Please wait, loading model...")
        #Optionally add parent to centre message on self.view
        #wait = wx.BusyInfo("Please wait, loading model...", parent=self.view)
        wx.GetApp().Yield()
        self.model = Model()
        self.view.SetStatusText("Model loaded", 0)
        del wait

def main():
    app = wx.App()
    controller = Controller()
    app.MainLoop()

if __name__ == '__main__':
    main()

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