Remember the steps, do be do be do
BACKGROUND In order to alter the theme of Ant Design, there are multiple target files that we have to change. The most important file will be the webpack config file, however, it is hard to access it directly. The file is located inside the folder of node modules:
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node_modules/react-scripts/config/webpack.config.js |
We can also make use of npm run eject directly to get…
Required CSV oecd_bli_2015.csv gdp_per_capita.csv prepare_country_stats()
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def prepare_country_stats(oecd_bli, gdp_per_capita): oecd_bli = oecd_bli[oecd_bli["INEQUALITY"] == "TOT"] oecd_bli = oecd_bli.pivot( index="Country", columns="Indicator", values="Value") gdp_per_capita.rename(columns={"2015": "GDP per capita"}, inplace=True) gdp_per_capita.set_index("Country", inplace=True) full_country_stats = pd.merge(left=oecd_bli, right=gdp_per_capita, left_index=True, right_index=True) full_country_stats.sort_values(by="GDP per capita", inplace=True) remove_indices = [0, 1, 6, 8, 33, 34, 35] keep_indices = list(set(range(36)) - set(remove_indices)) return full_country_stats[["GDP per capita", 'Life satisfaction']].iloc[keep_indices] |
Completed code for example 1.1
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import pandas as pd import matplotlib import matplotlib.pyplot as plt import sklearn.linear_model import sklearn.neighbors import numpy as np def prepare_country_stats(oecd_bli, gdp_per_capita): oecd_bli = oecd_bli[oecd_bli["INEQUALITY"] == "TOT"] oecd_bli = oecd_bli.pivot( index="Country", columns="Indicator", values="Value") gdp_per_capita.rename(columns={"2015": "GDP per capita"}, inplace=True) gdp_per_capita.set_index("Country", inplace=True) full_country_stats = pd.merge(left=oecd_bli, right=gdp_per_capita, left_index=True, right_index=True) full_country_stats.sort_values(by="GDP per capita", inplace=True) remove_indices = [0, 1, 6, 8, 33, 34, 35] keep_indices = list(set(range(36)) - set(remove_indices)) return full_country_stats[["GDP per capita", 'Life satisfaction']].iloc[keep_indices] if __name__ == "__main__": oecd_bli = pd.read_csv("oecd_bli_2015.csv", thousands=',') gdp_per_capita = pd.read_csv( "gdp_per_capita.csv", thousands=',', delimiter='\t', encoding='latin1', na_values='n/a') country_stats = prepare_country_stats(oecd_bli, gdp_per_capita) country_stats.plot(kind='scatter', x="GDP per capita", y="Life satisfaction") X = np.c_[country_stats["GDP per capita"]] Y = np.c_[country_stats["Life satisfaction"]] model = sklearn.linear_model.LinearRegression() # model = sklearn.neighbors.KNeighborsRegressor(n_neighbors=3) model.fit(X, Y) for x in range(10, 50): plot_x = 1000 * x plot_y = float(model.predict([[plot_x]])) plt.scatter(plot_x, plot_y, s=10, color='r') plt.show() |
Plotting using sklearn.linear_model.LinearRegression(): Plotting using sklearn.neighbors.KNeighborsRegressor()with sampling n = 3:
Character & map collision First of all, BoxCollider2D are required and added to both character and map tiles to make sure proper collision detection. Rigidbody2D allows us to connect the physical properties of the character and access it from the C# script. Initialize the object before the Start() function
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using System.Collections; using System.Collections.Generic; using UnityEngine; public class movementMain : MonoBehaviour { private Rigidbody2D rb; ... ... ... } |
In start(), we…
Declaration
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vector<int> v; // Size of 100 and initialize all to 0 vector<int> v(100, 0) // Reserve size of 3, to prevent extra complexity for copying v.reserve(3); |
Simple operation
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int n; v.push_back(n); |
Fill with something
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fill(v.begin(), v.end(), 101); |
Combine two vectors
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vector<int> head, tail; head.insert(head.end(), tail.begin(), tail.end()); |
In-place solution for creating object
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class Coord { private: int x, y; public: Coord(int x, int y) : x(x), y(y) {} }; |
Originally, object gets created first in the main stack and then copied to the vector’s memory address
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vector<Coord>v; Coord tmp(1, 2); v.push_back(tmp); |
In-place object creation can be achieved and save the computing time for copying the object
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vector<Coord>v; v.emplace_back(1, 2); // Pass the parameters of the constructor directly |
As suggested in both Quora and StackOverflow, the coin change problem should be the second problems for beginner to solve. There are actually multiple variations of this problem, however, my approach will be finishing the basic version first, which is: Given a set of coins with values, find the possible way to form N (order is not considered). Example: Given…
It is rather complicated to consider the advance level of dynamic programming at the beginning, so I have decided to start with a basic example: finding Fibonacci numbers. Since the concepts of recursion and memorization are often required in dynamic programming, therefore, I have implemented a version of memorization. Set base case of 0 and 1 equal to 1 Check…
Problem The following errors occur in visual code editor
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"message": "E0611:No name 'request' in module 'urllib'", "source": "pylint" |
Solution It should be an import error of from urllib.request import urlopen, which I am trying to use modern python3 library. Similarly, same errors keep popping up during the bootstrap of flask server. It can be concluded that the error is caused by the conflicts of python version, which the…
Problem The following lines are not fatal error but still needed to be solved
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==> default: Unknown device: enp0s8. Please specify device in "bus:slot.func" format ==> default: Unknown device: enp0s9. Please specify device in "bus:slot.func" format ==> default: Unknown device: enp0s10. Please specify device in "bus:slot.func" format ==> default: Unknown device: enp0s16. Please specify device in "bus:slot.func" format |
Approach 1. The network adapter is incorrectly assigned and I will match the device accordingly in the provision.sh Since we are able to ssh into the vagrant, we can check the interface mapping by
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vagrant ssh cat lua/if_map.lua |
The content of interface mapping file
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return { ["eth0"] = "0000:00:03.0", ["eth1"] = "0000:00:08.0", ["eth2"] = "0000:00:09.0", ["eth3"] = "0000:00:0a.0", ["eth4"] = "0000:00:10.0", } |
Which…
Problem The memory allocation failed during the vagrant up –provision
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==> default: virtual memory exhausted: Cannot allocate memory ==> default: make[3]: ==> default: *** [virtio_net.o] Error 1 ==> default: make[2]: *** [librte_vhost] Error 2 ==> default: make[1]: *** [lib] Error 2 ==> default: make: *** [all] Error 2 ==> default: modprobe: FATAL: Module uio not found. ==> default: modprobe: FATAL: Module uio_pci_generic not found. ==> default: insmod: ERROR: could not insert module /home/vagrant/gatekeeper/dependencies/dpdk/build/kmod/igb_uio.ko: Unknown symbol in module |
Approach 1. As we are using the cloud image from vagrant, the kernel contains the minimal dependencies, therefore, some modules required are missing. I will append the linux-generic to the provision.sh to ensure the modules uio and uio_pci_generic are corrected configured. Result: The following two lines are…
Problem I’m trying to create the virtual machine using vagrant for the dpdk, however, the screen was freezing at this period of vagrant up
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==> default: Waiting for machine to boot. This may take a few minutes... default: SSH address: 127.0.0.1:2222 default: SSH username: vagrant default: SSH auth method: private key |
Approach 1. Making sure the conflicts is not caused by the conflicts of version between vagrant and virtual box. Result: I have downloaded the archive of both software and do a mix and match. However, the…