Posts

Using the right Emacs Version #I failed to preview LaTeX with emacs-plus. If you have installed d12frosted/emacs-plus, uninstall it and use emacs-mac. brew tap railwaycat/emacsmacport brew install emacs-mac If you like the fancy spacemacs icon, install it with cask: brew cask install emacs-mac-spacemacs-icon

PyTorch provide a simple DQN implementation to solve the cartpole game. However, the code is incorrect, it diverges after training (It has been discussed here). The official code’s training data is below, it’s high score is about 50 and finally diverges.

Recently, I found a really good example code for Python circular import, and I’d like to record it here. Here is the code: 1 2 3 4 5 6 7 8 # X.py def X1(): return "x1" from Y import Y2 def X2(): return "x2" 1 2 3 4 5 6 7 8 # Y.

Overview # CPython allocation memory to save dictionary, the initial table size is 8, entries are saved as <hash,key,value> in each slot(The slot content changed after Python 3.6). When a new key is added, python use i = hash(key) & mask where mask=table_size-1 to calculate which slot it should be placed.

PyTorch is a really powerful framework to build the machine learning models. Although some features is missing when compared with TensorFlow (For example, the early stop function, History to draw plot), its code style is more intuitive. Torchtext is a NLP package which is also made by pytorch team.

CSRF(Cross-site request forgery) is a way to generate fake user request to target website. For example, on a malicious website A, there is a button, click it will send request to www.B.com/logout. When the user click this button, he will logout from website B unconsciously.

Recently, I’m working on a neo4j project. I use Py2neo to interact with graph db. Alghough Py2neo is a very pythonic and easy to use, its performance is really poor. Sometimes I have to manually write cypher statement by myself if I can’t bear with the slow excution.

Recently, I enjoy using Spacemacs, so I decided to switch to org file from Markdown for writing blog. After several attempts, I managed to let Travis convert org file to HTML. Here are the steps. Install Org Mode plugin #First you need to install Org Mode plugin on your computer following the official guide: Nikola orgmode plugin.

After searching from Google, here is easiest solution. This should also works on other languages: import matplotlib.pyplot as plt %matplotlib inline %config InlineBackend.figure_format = 'retina' import matplotlib.font_manager as fm f = "/System/Library/Fonts/PingFang.ttc" prop = fm.FontProperties(fname=f) plt.title("你好",fontproperties=prop) plt.show() Output:

LSTM #The avoid the problem of vanishing gradient and exploding gradient in vanilla RNN, LSTM was published, which can remember information for longer periods of time. Here is the structure of LSTM: The calculate procedure are: \[\begin{aligned} f_t&=\sigma(W_f\cdot[h_{t-1},x_t]+b_f)\\ i_t&=\sigma(W_i\cdot[h_{t-1},x_t]+b_i)\\ o_t&=\sigma(W_o\cdot[h_{t-1},x_t]+b_o)\\ \tilde{C_t}&=tanh(W_C\cdot[h_{t-1},x_t]+b_C)\\ C_t&=f_t\ast C_{t-1}+i_t\ast \tilde{C_t}\\ h_t&=o_t \ast tanh(C_t) \end{aligned}\]