When it comes to predictive modeling , A single algorithmic model might be not be enough to make the most optimal predictions.
One of the most effective methodologies in machine learning is Ensemble Modeling or Ensembles.
Ensemble Modeling is the combination of multiple machine learning models that follow the same or different algorithm to make better overall predictions.
It is usually these types of models that win the machine learning competitions conducted by netflix or kaggle.
Categories
Ensemble modeling methods can be split into various categories.
they are:
- Sequential
What is a Probability Distribution ?
Probability Distribution : A probability Distribution shows the list of probabilities associated with each value or a range of values for a discrete or a continuous random variable.
Based on the Type of Random Variable, Probability Distributions can be split into Continuous Probability Distributions and Discrete Probability Distributions
What are Convolutional Neural Networks ?
Convolutional Neural Networks is a type of neural network that is mostly used for Image Datasets and The shared parameters feature of convolutional network reduces the number of parameters for the model and this also makes it efficient in pattern Edge-Detection. This blog post contains the implementation of Convolutional Neural Networks with tensorflow 2.0 on the Cats vs Dogs dataset
About the Dataset
Cats vs Dogs dataset is one of the most famous dataset used in the field of machine learning, which was developed by the partnership between pathfinder.com and Microsoft.
The Dataset is available at : https://www.microsoft.com/en-us/download/details.aspx?id=54765
Note: The code files will be available at : https://github.com/ashwinhprasad/Tensorflow-2.0/blob/master/TF2-(4)-ANN/TF2-ANNs.ipynb
Introduction
Artificial Neural Networks are the traditional neural networks which means that there are more than or equal to one layer between the input and the output layer. This allows for the model to adapt for the non linearity and form complex functions which makes it useful in real life.
This blog post does not covers only the implementation of feed forward or artificial neural network with tensorflow 2 and not the theory part of the artificial neural network.
Note : The Program files for tensorflow 2 can be found on - https://github.com/ashwinhprasad/Tensorflow-2.0
Logistic Regression is used for Classification tasks and This Blog will take you through the implementation of logistic regression using Tensorflow 2. This blog post won’t be covering about the theories regarding logistic regression and theory is a pre-requisite.
Let’s jump to the code part :
1. Importing The Dataset
The Dataset that is used in this example is iris dataset from the sklearn library.
we are importing the dataset and storing it in the form of a pandas dataframe
#importing the libraries import numpy as np import tensorflow as tf import pandas as pd import matplotlib.pyplot…
Code files will be available at : https://github.com/ashwinhprasad/Tensorflow-2.0
What is Linear Regression ?
Linear regression is basically using a equation of a line to find out the linear relationship between 2 variables. By finding the linear relationship, I mean finding the parameters ( Slope and Intercept).
y = m*x + c
y : dependent variable
x : independent variable
m : slope
c : intercept
Note : All code files will be available at https://github.com/ashwinhprasad/Tensorflow-2.0
This blog post will cover some basic functions that will be repeatedly used a lot in tensorflow 2.
Random
random.normal generates random values of the given shape, which follow normal distribution
and random.uniform generates random values in such a way that probability of choosing any number from the random bunch is almost uniform
#normal distribution
x1 = tf.random.normal(shape=(5,5),mean=0,stddev=1)
#normal distribution
print(x1)output: tf.Tensor( [[-1.1473149e+00 5.1616412e-01 -2.8656033e-01 -1.4161720e-03 -6.7782238e-02] [ 1.5549400e-01 -1.8609362e+00 7.8299832e-01 -7.3712116e-01 -3.0330741e-01] [ 5.6524660e-02 1.0138390e-01 1.2218195e+00 1.2505690e+00 3.0457941e-01] [ 3.6436683e-01 -8.6699528e-01 1.5152076e+00 7.8330201e-01 -1.4127023e+00] [-1.2999429e+00 1.3505920e+00 1.0376108e+00 -1.5029492e+00 9.7778231e-01]]…
What is Tensorlfow ?
Tensorflow is a DeepLearning library which has a lot of inbuilt classes and functions which allow you to perform these complex deep learning matrix multiplications and gradient calculations easily. The main Goal behind tensorflow is to make developing machine learning models easier and get it to a production environment.
Advantages of Tensorflow 2 over The first Version
As everyone already know, The updated version of tensorflow allows the user to create models easily whereas it was quite difficult with tensorflow’s first version.
Installation
You could directly use tensorflow from google colab (I prefer this) or type
“pip install tensorflow” for windows users and
“pip3 install tensorflow2” for linux users
Tensor Basics
…
Note
sorry for misspelling network , lol.
All the code files will be available at : https://github.com/ashwinhprasad/PyTorch-For-DeepLearning
What are RNNs and LSTMs ?
Recurrence Neural Network are great for Sequence data and Time Series Data. Long short-term memory is an artificial recurrent neural network architecture used in the field of deep learning. LSTMs and RNNs are used for sequence data and can perform better for timeseries problems.
An LSTM is an advanced version of RNN and LSTM can remember things learnt earlier in the sequence using gates added to a regular RNN. Both LSTM’s and RNN’s working are similar in PyTorch. So, once we coded the Lstm…
Note : All the code files will be available at : https://github.com/ashwinhprasad/SentimentAnalysis
What is Sentiment Analysis ?
Sentiment analysis in simple words is basically analysing how an user feels about an item or any other thing from the user’s activity such as reviews , tweets, etc.
Jumping to Code
- Importing the Libraries
import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
import nltk2. Downloading NLTK
Use the nltk shell to download the english stopwords.
3. Importing the dataset
df = pd.read_csv('IMDB Dataset.csv')
df.head()output :
