This week, we'll learn about functions as first-class values, and higher order functions. We'll also learn about Scala's syntax and how it's formally defined. Finally, we'll learn about methods, classes, and data abstraction through the design of a data structure for rational numbers.
higher order functions …
In this week, we'll learn the difference between functional imperative programming. We step through the basics of Scala; covering expressions, evaluation, conditionals, functions, and recursion
imperative programming:
~~~> Von Neumann computer:
conceptualize data structures …
Get up and running with Scala on your computer. Complete an example assignment to familiarize yourself with our unique way of submitting assignments.
use worksheet as a better REPL
navigate to the directory of the assignment you are working on, then start sbt.
(when first running …
problems with text:
→ need a lot of labeled data ⇒ not realistic.
⇒ unsupervised learning
similar words appear in similar context.
embedding: map words to small vectors
measure the closeness by cosine distance:
initial: random vector …
statistical invariance → weight sharing
e.g. image colors, translation invariance...
is NNs that share their weights across space.
convolution: slide a small patch of NN over the image to produce a new "image"
convnet forms a pyramid, each "stack of pincake" get larger depth and smaller area.
matrix multiplication: fast with GPU
numerically stable
cannot cocatenate linear units → equivalent to one big matrix...
⇒ add non-linear units in between
chain rule: efficient computationally
easy to compute the gradient as long as the function Y(X) is made of simple blocks …
这是udacity上deeplearning的笔记, 做得非常粗糙, 而且这门课也只是介绍性质的... https://www.udacity.com/course/deep-learning--ud730
socres yi ⇒ probabilities pi
property: smaller scores ⇒ less certain about result
measure how well the probability …
总结一下用python撸codejam时常用的一些库, 并且给一些简单的例子. 发现用python撸codejam非常合适: codejam的时间要求不严格(4/8分钟), 而且程序只要本地运行. 正好可以使用python简洁的语法和丰富的函数库.
py自带的一些好用的数据结构...
https://docs.python.org/2/library/collections.html …
昨天做的一道codejam题目, 这个题目的三种解法都非常有代表性, 特此一记.
题目链接在这里:
https://code.google.com/codejam/contest/8234486/dashboard#s=p2
Elliot's parents speak French and English …
之前一直用weka的GUI界面做机器学习的任务, 感觉这个软件虽然界面丑, 不过确实是快速开展机器学期的利器. 关于GUI的weka使用以后有时间再写. 今天这篇记录一下最近使用的java版本的weka …