dictionary

ValueError: Feature not in features dictionary

由 ￡可爱￡侵袭症＋ 提交于 2020-12-25 08:29:47
问题 I am attempting to write a simple deep machine learning model using TensorFlow. I'm using a toy dataset I made up in Excel just to get the model working and accepting data. My code is as follows: import pandas as pd import numpy as np import tensorflow as tf raw_data = np.genfromtxt('ai/mock-data.csv', delimiter=',', dtype=str) my_data = np.delete(raw_data, (0), axis=0) #deletes the first row, axis=0 indicates row, axis=1 indicates column my_data = np.delete(my_data, (0), axis=1) #deletes the

ValueError: Feature not in features dictionary

由 和自甴很熟 提交于 2020-12-25 08:26:50
问题 I am attempting to write a simple deep machine learning model using TensorFlow. I'm using a toy dataset I made up in Excel just to get the model working and accepting data. My code is as follows: import pandas as pd import numpy as np import tensorflow as tf raw_data = np.genfromtxt('ai/mock-data.csv', delimiter=',', dtype=str) my_data = np.delete(raw_data, (0), axis=0) #deletes the first row, axis=0 indicates row, axis=1 indicates column my_data = np.delete(my_data, (0), axis=1) #deletes the

C#6.0新语法

由 半城伤御伤魂 提交于 2020-12-24 02:55:11
一、自动属性初始化 在以前的C#版本中，属性是这样写的： 1 public int Id { get ; set ; } 2 public string Name { get ; set ; } 在C#6.0中，属性可以自动赋初始值，例如： 1 public string Name { get ; set ; } = " summit " ; 2 public int Age { get ; set ; } = 22 ; 3 public DateTime BirthDay { get ; set ; } = DateTime.Now.AddYears(- 20 ); 4 public IList< int > AgeList 5 { 6 get ; 7 set ; 8 } = new List< int > { 10 , 20 , 30 , 40 , 50 }; 二、导入静态类 我们都知道，使用静态类的方法时是使用类名.方法名的形式，例如： 1 Console.WriteLine($ " 之前的使用方式: {Math.Pow(4, 2)} " ); 这里的Math是框架自带的静态类，要使用Pow()方法，必须要向上面的代码一样。在C#6.0中可以用下面的方式使用静态类的方法，例如： 1、使用using导入静态类 2、导入静态类以后，可以像使用普通方法一样，直接使用，例如： 1

Convert dictionary into list with length based on values

由 泪湿孤枕 提交于 2020-12-23 04:54:55
问题 I have a dictionary d = {1: 3, 5: 6, 10: 2} I want to convert it to a list that holds the keys of the dictionary. Each key should be repeated as many times as its associated value. I've written this code that does the job: d = {1: 3, 5: 6, 10: 2} l = [] for i in d: for j in range(d[i]): l.append(i) l.sort() print(l) Output: [1, 1, 1, 5, 5, 5, 5, 5, 5, 10, 10] But I would like it to be a list comprehension. How can this be done? 回答1: You can do it using a list comprehension: [i for i in d for

Are javascript object keys case sensitive?

由 a 夏天 提交于 2020-12-23 03:39:05
问题 I was trying to fix duplicate items in an array on javascript by the means of object keys. The loop added 'virtual reality' and 'Virtual Reality' in the same object as different keys. Is there a way to make Javascript object not case sensitive ? 回答1: While object properties are strings and they are case sensitive, you could use an own standard and use only lower case letters for the access. You could apply a String#toLowerCase to the key and use a function as wrapper for the access. Example

Remove from Dictionary by Key and Retrieve Value

由 一笑奈何 提交于 2020-12-23 01:57:14
问题 Is there a way to remove an entry from a Dictionary (by Key ) AND retrieve it's Value in "the same step?" For example, I'm calling Dictionary.Remove(Key); but I also want to return the Value at the same time. The function only returns a bool . I know I can do something like Value = Dictionary[Key]; Dictionary.Remove(Key); but it seems like this will search the dictionary twice (once to get the value, and another time to remove it from the dictionary). How can I (if possible) do both WITHOUT

Remove from Dictionary by Key and Retrieve Value

由 大兔子大兔子 提交于 2020-12-23 01:56:25
问题 Is there a way to remove an entry from a Dictionary (by Key ) AND retrieve it's Value in "the same step?" For example, I'm calling Dictionary.Remove(Key); but I also want to return the Value at the same time. The function only returns a bool . I know I can do something like Value = Dictionary[Key]; Dictionary.Remove(Key); but it seems like this will search the dictionary twice (once to get the value, and another time to remove it from the dictionary). How can I (if possible) do both WITHOUT

Remove from Dictionary by Key and Retrieve Value

由 百般思念 提交于 2020-12-23 01:56:22
问题 Is there a way to remove an entry from a Dictionary (by Key ) AND retrieve it's Value in "the same step?" For example, I'm calling Dictionary.Remove(Key); but I also want to return the Value at the same time. The function only returns a bool . I know I can do something like Value = Dictionary[Key]; Dictionary.Remove(Key); but it seems like this will search the dictionary twice (once to get the value, and another time to remove it from the dictionary). How can I (if possible) do both WITHOUT

深入理解设计模式（22）：享元模式

由 六眼飞鱼酱① 提交于 2020-12-18 02:45:51
一、引言 大家都知道 单例模式 ，通过一个全局变量来避免重复创建对象而产生的消耗，若系统存在大量的相似对象时，又该如何处理？参照单例模式，可通过对象池缓存可共享的对象，避免创建多对象，尽可能减少内存的使用，提升性能，防止内存溢出。 在软件开发过程，如果我们 需要重复使用某个对象的时候，如果我们重复地使用new创建这个对象的话，这样我们在内存就需要多次地去申请内存空间了，这样可能会出现内存使用越来越多的情况 ，这样的问题是非常严重，然而享元模式可以解决这个问题，下面具体看看享元模式是如何去解决这个问题的。 二、什么是享元模式 定义： 共享元对象，运用共享技术有效地支持大量细粒度对象的复用。如果在一个系统中存在多个相同的对象，那么只需要共享一份对象的拷贝，而不必为每一次使用创建新的对象。 享元模式是为数不多的、只为提升系统性能而生的设计模式，主要作用就是复用大对象（重量级对象），以节省内存空间和对象创建时间。 　 面向对象可以非常方便的解决一些扩展性的问题，但是在这个过程中系统务必会产生一些类或者对象，如果系统中存在对象的个数过多时，将会导致系统的性能下降。对于这样的问题解决最简单直接的办法就是减少系统中对象的个数。享元模式提供了一种解决方案，使用共享技术实现相同或者相似对象的重用。也就是说实现相同或者相似对象的代码共享。 所谓享元模式就是运行共享技术有效地支持大量细粒度对象的复用

Is there any threadsafe class for Set

由 我们两清 提交于 2020-12-16 05:32:04
问题 We have Vector for List, and Hashtable for Map. Similarly do we have any class which has thread safe methods for Set? 回答1: One option: (java8) Set<String> set = ConcurrentHashMap.newKeySet(); which is similar to HashSet, but also safe to use concurrently. 回答2: There are ways to get thread safe sets. some e.g. CopyOnWriteArraySet Collections.synchronizedSet(Set set) etc Check this for more details - Different types of thread-safe Sets in Java 回答3: Vector and Hashtable are relics from before
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