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Deep Learning Prerequisites The Numpy Stack in Python [Updated]

Author: voska89 on 16-01-2019, 10:52, Views: 11

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Deep Learning Prerequisites The Numpy Stack in Python [Updated]
Deep Learning Prerequisites: The Numpy Stack in Python
MP4 | Video: AVC 1280x720 | Audio: AAC 44KHz 2ch | Duration: 3.5 Hours | Lec: 35 | 613 MB
Genre: eLearning | Language: English


The Numpy, Scipy, Pandas, and MatDescriptionlib stack: prep for deep learning, machine learning, and artificial intelligence
Welcome! This is Deep Learning, Machine Learning, and Data Science Prerequisites: The Numpy Stack in Python.
One question or concern I get a lot is that people want to learn deep learning and data science, so they take these courses, but they get left behind because they don't know enough about the Numpy stack in order to turn those concepts into code.
Even if I write the code in full, if you don't know Numpy, then it's still very hard to read.
This course is designed to remove that obstacle - to show you how to do things in the Numpy stack that are frequently needed in deep learning and data science.
So what are those things?
Numpy. This forms the basis for everything else. The central object in Numpy is the Numpy array, on which you can do various operations.
The key is that a Numpy array isn't just a regular array you'd see in a language like Java or C++, but instead is like a mathematical object like a vector or a matrix.
That means you can do vector and matrix operations like addition, subtraction, and multiplication.
The most important aspect of Numpy arrays is that they are optimized for speed. So we're going to do a demo where I prove to you that using a Numpy vectorized operation is faster than using a Python list.
Then we'll look at some more complicated matrix operations, like products, inverses, determinants, and solving linear systems.
Pandas. Pandas is great because it does a lot of things under the hood, which makes your life easier because you then don't need to code those things manually.
Pandas makes working with datasets a lot like R, if you're familiar with R.
The central object in R and Pandas is the DataFrame.
We'll look at how much easier it is to load a dataset using Pandas vs. trying to do it manually.
Then we'll look at some dataframe operations, like filtering by column, filtering by row, the apply function, and joins, which look a lot like SQL joins.
So if you have an SQL background and you like working with tables then Pandas will be a great next thing to learn about.
Since Pandas teaches us how to load data, the next step will be looking at the data. For that we will use MatDescriptionlib.
In this section we'll go over some common Descriptions, namely the line chart, scatter Description, and histogram.
We'll also look at how to show images using MatDescriptionlib.
99% of the time, you'll be using some form of the above Descriptions.
Scipy.
I like to think of Scipy as an addon library to Numpy.
Whereas Numpy provides basic building blocks, like vectors, matrices, and operations on them, Scipy uses those general building blocks to do specific things.
For example, Scipy can do many common statistics calculations, including getting the PDF value, the CDF value, sampling from a distribution, and statistical testing.
It has signal processing tools so it can do things like convolution and the Fourier transform.
In sum:
If you've taken a deep learning or machine learning course, and you understand the theory, and you can see the code, but you can't make the connection between how to turn those algorithms into actual running code, this course is for you.
All the code for this course can be downloaded from my github: /lazyprogrammer/machine_learning_examples
In the directory: numpy_class
Make sure you always "git pull" so you have the latest version!
HARD PREREQUISITES / KNOWLEDGE YOU ARE ASSUMED TO HAVE:
linear algebra
probability
Python coding: if/else, loops, lists, dicts, sets
you should already know "why" things like a dot product, matrix inversion, and Gaussian probability distributions are useful and what they can be used for



Deep Learning Prerequisites The Numpy Stack in Python [Updated]





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