01 2019 档案
摘要：Using Series (Row-Wise) Using Series (Column-Wise) Using Dictionary (Columnwise) Using Nested Dictionary The outer dictionary is columnwise and the in
阅读全文
摘要：Matrix and Determinant Let C be an M × N matrix with real-valued entries, i.e. C={cij}mxn Determinant is a value that can be computed from the element
阅读全文
摘要：I Got a SettingWithCopyWarning when I ran the following code: The details of the Warning are : Then I got the inspiration from https://stackoverflow.c
阅读全文
摘要：从昨天晚上开始安装xgboost，经历了各种稀奇古怪的错误，终于现在程序可以跑起来了。整个过程对python编译环境，路径设置，package安装方法有了一定了解，当然还有一些疑惑，所以姑且做个记录。 系统：Mac OS Mojave 10.14 IDE：Anaconda （严格来讲，Anacond
阅读全文
摘要：Convert from list Apply np.array() method to convert a list to a numpy array: Apply np.array() method to convert a list to a numpy array: Apply np.arr
阅读全文
摘要：1-D Array Indexing Use bracket notation [ ] to get the value at a specific index. Remember that indexing starts at 0. Output: array([ 0, 1, 2, 3, 4, 5
阅读全文
摘要：The Dataset was acquired from https://www.kaggle.com/c/titanic For data preprocessing, I firstly defined three transformers: DataFrameSelector: Select
阅读全文
摘要：In the former article "Data Preparation by Pandas and Scikit-Learn", we discussed about a series of steps in data preparation. Scikit-Learn provides t
阅读全文
摘要：In this article, we dicuss some main steps in data preparation. Drop Labels Firstly, we drop labels for train set. Here we use drop() method in Pandas
阅读全文
摘要：Train model: Show parameters of best model: Show the score of train set: Fit on test set: Show the score of test set: More about GridSearchCV: https:/
阅读全文
摘要：1. Using for-loop Iterate along row axis: Output: [1 2 3] [4 5 6] Iterate by index: Output: [1 2 3] [4 5 6] Iterate by row and index: Iterate by row a
阅读全文
摘要：1. Reshape: The np.reshape() method will give a new shape to an array without changing its data. Note that the new shape should be compatible with the
阅读全文
摘要：数组拼接方法一 思路：首先将数组转成列表，然后利用列表的拼接函数 、`extend()`等进行拼接处理，最后将列表转成数组。 示例1： [1, 2, 5, 10, 12, 15] array([ 1, 2, 5, 10, 12, 15]) 该方法只适用于简单的一维数组拼接，由于转换过程很耗时间，对于
阅读全文
摘要：Here is a function in Numpy module which could apply a function to 1D slices along the Given Axis. It works like apply funciton in Pandas. This functi
阅读全文
摘要：You can launch IPython on the command line just like launching the regular Python interpreter except with the ipython command: $ ipython Then you can
阅读全文
浙公网安备 33010602011771号