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<?xml version="1.0" encoding="UTF-8"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:content="http://purl.org/rss/1.0/modules/content"><channel><title>Navan Chauhan</title><description>I try to post tutorials, tips and tricks related to programming, designing and just some science stuff</description><link>https://navanchauhan.github.io/SwiftWebsite/</link><language>en</language><lastBuildDate>Sat, 4 Jan 2020 14:28:26 +0530</lastBuildDate><pubDate>Sat, 4 Jan 2020 14:28:26 +0530</pubDate><ttl>250</ttl><atom:link href="https://navanchauhan.github.io/SwiftWebsite/feed.rss" rel="self" type="application/rss+xml"/><item><guid isPermaLink="true">https://navanchauhan.github.io/SwiftWebsite/posts/splitting-zips</guid><title>Splitting ZIPs into Multiple Parts</title><description>Short code snippet for splitting zips.</description><link>https://navanchauhan.github.io/SwiftWebsite/posts/splitting-zips</link><pubDate>Sun, 8 Dec 2019 13:27:00 +0530</pubDate><content:encoded><![CDATA[<h1>Splitting ZIPs into Multiple Parts</h1><p><strong>Tested on macOS</strong></p><p>Creating the archive:</p><pre><code>zip -r -s 5 oodlesofnoodles.zip website/
</code></pre><p>5 stands for each split files' size (in mb, kb and gb can also be specified)</p><p>For encrypting the zip:</p><pre><code>zip -er -s 5 oodlesofnoodles.zip website
</code></pre><p>Extracting Files</p><p>First we need to collect all parts, then</p><pre><code>zip -F oodlesofnoodles.zip --out merged.zip
</code></pre>]]></content:encoded></item><item><guid isPermaLink="true">https://navanchauhan.github.io/SwiftWebsite/tutorials/custom-image-classifier-keras-tensorflow</guid><title>Creating a Custom Image Classifier using Tensorflow 2.x and Keras for Detecting Malaria</title><description>Short tutorial for creating a custom image classifier using TF 2.0</description><link>https://navanchauhan.github.io/SwiftWebsite/tutorials/custom-image-classifier-keras-tensorflow</link><pubDate>Sun, 8 Dec 2019 11:27:00 +0530</pubDate><content:encoded><![CDATA[<h1>Creating a Custom Image Classifier using Tensorflow 2.x and Keras for Detecting Malaria</h1><p><strong>Done during Google Code-In. Org: Tensorflow.</strong></p><h2>Imports</h2><pre><code>%tensorflow_version 2.x #This is for telling Colab that you want to use TF 2.0, ignore if running on local machine
from PIL import Image # We use the PIL Library to resize images
import numpy as np
import os
import cv2
import tensorflow as tf
from tensorflow.keras import datasets, layers, models
import pandas as pd
import matplotlib.pyplot as plt
from keras.models import Sequential
from keras.layers import Conv2D,MaxPooling2D,Dense,Flatten,Dropout
</code></pre><h2>Dataset</h2><h3>Fetching the Data</h3><pre><code>!wget ftp://lhcftp.nlm.nih.gov/Open-Access-Datasets/Malaria/cell_images.zip
!unzip cell_images.zip
</code></pre><h3>Processing the Data</h3><p>We resize all the images as 50x50 and add the numpy array of that image as well as their label names (Infected or Not) to common arrays.</p><pre><code>data = []
labels = []
Parasitized = os.listdir("./cell_images/Parasitized/")
for parasite in Parasitized:
try:
image=cv2.imread("./cell_images/Parasitized/"+parasite)
image_from_array = Image.fromarray(image, 'RGB')
size_image = image_from_array.resize((50, 50))
data.append(np.array(size_image))
labels.append(0)
except AttributeError:
print("")
Uninfected = os.listdir("./cell_images/Uninfected/")
for uninfect in Uninfected:
try:
image=cv2.imread("./cell_images/Uninfected/"+uninfect)
image_from_array = Image.fromarray(image, 'RGB')
size_image = image_from_array.resize((50, 50))
data.append(np.array(size_image))
labels.append(1)
except AttributeError:
print("")
</code></pre><h3>Splitting Data</h3><pre><code>df = np.array(data)
labels = np.array(labels)
(X_train, X_test) = df[(int)(0.1*len(df)):],df[:(int)(0.1*len(df))]
(y_train, y_test) = labels[(int)(0.1*len(labels)):],labels[:(int)(0.1*len(labels))]
</code></pre><pre><code>s=np.arange(X_train.shape[0])
np.random.shuffle(s)
X_train=X_train[s]
y_train=y_train[s]
X_train = X_train/255.0
</code></pre><h2>Model</h2><h3>Creating Model</h3><p>By creating a sequential model, we create a linear stack of layers.</p><p><em>Note: The input shape for the first layer is 50,50 which corresponds with the sizes of the resized images</em></p><pre><code>model = models.Sequential()
model.add(layers.Conv2D(filters=16, kernel_size=2, padding='same', activation='relu', input_shape=(50,50,3)))
model.add(layers.MaxPooling2D(pool_size=2))
model.add(layers.Conv2D(filters=32,kernel_size=2,padding='same',activation='relu'))
model.add(layers.MaxPooling2D(pool_size=2))
model.add(layers.Conv2D(filters=64,kernel_size=2,padding="same",activation="relu"))
model.add(layers.MaxPooling2D(pool_size=2))
model.add(layers.Dropout(0.2))
model.add(layers.Flatten())
model.add(layers.Dense(500,activation="relu"))
model.add(layers.Dropout(0.2))
model.add(layers.Dense(2,activation="softmax"))#2 represent output layer neurons
model.summary()
</code></pre><h3>Compiling Model</h3><p>We use the adam optimiser as it is an adaptive learning rate optimization algorithm that's been designed specifically for <em>training</em> deep neural networks, which means it changes its learning rate automaticaly to get the best results</p><pre><code>model.compile(optimizer="adam",
loss="sparse_categorical_crossentropy",
metrics=["accuracy"])
</code></pre><h3>Training Model</h3><p>We train the model for 10 epochs on the training data and then validate it using the testing data</p><pre><code>history = model.fit(X_train,y_train, epochs=10, validation_data=(X_test,y_test))
</code></pre><pre><code>Train on 24803 samples, validate on 2755 samples
Epoch 1/10
24803/24803 [==============================] - 57s 2ms/sample - loss: 0.0786 - accuracy: 0.9729 - val_loss: 0.0000e+00 - val_accuracy: 1.0000
Epoch 2/10
24803/24803 [==============================] - 58s 2ms/sample - loss: 0.0746 - accuracy: 0.9731 - val_loss: 0.0290 - val_accuracy: 0.9996
Epoch 3/10
24803/24803 [==============================] - 58s 2ms/sample - loss: 0.0672 - accuracy: 0.9764 - val_loss: 0.0000e+00 - val_accuracy: 1.0000
Epoch 4/10
24803/24803 [==============================] - 58s 2ms/sample - loss: 0.0601 - accuracy: 0.9789 - val_loss: 0.0000e+00 - val_accuracy: 1.0000
Epoch 5/10
24803/24803 [==============================] - 58s 2ms/sample - loss: 0.0558 - accuracy: 0.9804 - val_loss: 0.0000e+00 - val_accuracy: 1.0000
Epoch 6/10
24803/24803 [==============================] - 57s 2ms/sample - loss: 0.0513 - accuracy: 0.9819 - val_loss: 0.0000e+00 - val_accuracy: 1.0000
Epoch 7/10
24803/24803 [==============================] - 58s 2ms/sample - loss: 0.0452 - accuracy: 0.9849 - val_loss: 0.3190 - val_accuracy: 0.9985
Epoch 8/10
24803/24803 [==============================] - 58s 2ms/sample - loss: 0.0404 - accuracy: 0.9858 - val_loss: 0.0000e+00 - val_accuracy: 1.0000
Epoch 9/10
24803/24803 [==============================] - 58s 2ms/sample - loss: 0.0352 - accuracy: 0.9878 - val_loss: 0.0000e+00 - val_accuracy: 1.0000
Epoch 10/10
24803/24803 [==============================] - 58s 2ms/sample - loss: 0.0373 - accuracy: 0.9865 - val_loss: 0.0000e+00 - val_accuracy: 1.0000
</code></pre><h3>Results</h3><pre><code>accuracy = history.history['accuracy'][-1]*100
loss = history.history['loss'][-1]*100
val_accuracy = history.history['val_accuracy'][-1]*100
val_loss = history.history['val_loss'][-1]*100
print(
'Accuracy:', accuracy,
'\nLoss:', loss,
'\nValidation Accuracy:', val_accuracy,
'\nValidation Loss:', val_loss
)
</code></pre><pre><code>Accuracy: 98.64532351493835
Loss: 3.732407123270176
Validation Accuracy: 100.0
Validation Loss: 0.0
</code></pre><p>We have achieved 98% Accuracy!</p><p><a href="https://colab.research.google.com/drive/1ZswDsxLwYZEnev89MzlL5Lwt6ut7iwp- "Colab Notebook"">Link to Colab Notebook</a></p>]]></content:encoded></item><item><guid isPermaLink="true">https://navanchauhan.github.io/SwiftWebsite/posts/hello-world</guid><title>Hello World</title><description>My first post.</description><link>https://navanchauhan.github.io/SwiftWebsite/posts/hello-world</link><pubDate>Tue, 16 Apr 2019 17:39:00 +0530</pubDate><content:encoded><![CDATA[<h1>Hello World</h1><p><strong>Why a Hello World post?</strong></p><p>Just re-did the entire website using Publish (Publish by John Sundell). So, a new hello world post :)</p>]]></content:encoded></item></channel></rss>
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