blem 2 Python Gradient descent learning in Python a Cre.pdf
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i. Create a NeuralNetwork class with an __init__ method that initializes a random weight vector, learning rate, and history variable to save weights and costs after each epoch. ii. The class includes a sigmoid activation function and forward_propagation method that takes inputs, multiplies them by weights, applies the sigmoid, and outputs the result. iii. A train method performs gradient descent learning for a specified number of iterations, using the inputs, labels, and learning rate to update the weights each iteration.
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![blem 2) [Python] Gradient descent learning in Python: a) Create class NeuralNetwork () : that
creates a single neuron with a linear activation, train it using gradient descent learning. This class
should have the following function: i. def _init_(self, learning_r): that initializes a 31 weight vector
randomly and initializes the learning rate to learning_r. Also, it creates a history variable that saves
the weights and the training cost after each epoch (i.e., iteration). ii. def sigmoid(self, x ): that takes
an input x, and applies the sigmoid function to return: (x)=1+ex1 iii. def forward_propagation(self,
inputs): that performs forward propagation by multiplying the inputs by the neuron weights, uses
sigmoid activation function and then generates the output. iv. def train(self, inputs_train,
labels_train, num_train_iterations): that performs the gradient descent learning rule for
num_train_iterations times using the inputs and labels.](https://image.slidesharecdn.com/blem2pythongradientdescentlearninginpythonacre-230322061444-67215c9a/85/blem-2-Python-Gradient-descent-learning-in-Python-a-Cre-pdf-1-320.jpg)
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Step 1: Load the Tox21 Dataset.
import numpy as np
np.random.seed(456)
import tensorflow as tf
tf.set_random_seed(456)
import matplotlib.pyplot as plt
import deepchem as dc
from sklearn.metrics import accuracy_score
_, (train, valid, test), _ = dc.molnet.load_tox21()
train_X, train_y, train_w = train.X, train.y, train.w
valid_X, valid_y, valid_w = valid.X, valid.y, valid.w
test_X, test_y, test_w = test.X, test.y, test.w
Step 2: Remove extra datasets.
# Remove extra tasks
train_y = train_y[:, 0]
valid_y = valid_y[:, 0]
test_y = test_y[:, 0]
train_w = train_w[:, 0]
valid_w = valid_w[:, 0]
test_w = test_w[:, 0]
Step 3: Define placeholders that accept minibatches of different sizes.
# Generate tensorflow graph
d = 1024
n_hidden = 50
learning_rate = .001
n_epochs = 10
batch_size = 100
with tf.name_scope("placeholders"):
x = tf.placeholder(tf.float32, (None, d))
y = tf.placeholder(tf.float32, (None,))
Step 4: Implement a hidden layer.
with tf.name_scope("hidden-layer"):
W = tf.Variable(tf.random_normal((d, n_hidden)))
b = tf.Variable(tf.random_normal((n_hidden,)))
x_hidden = tf.nn.relu(tf.matmul(x, W) + b)
Step 5: Complete the fully connected architecture.
with tf.name_scope("output"):
W = tf.Variable(tf.random_normal((n_hidden, 1)))
b = tf.Variable(tf.random_normal((1,)))
y_logit = tf.matmul(x_hidden, W) + b
# the sigmoid gives the class probability of 1
y_one_prob = tf.sigmoid(y_logit)
# Rounding P(y=1) will give the correct prediction.
y_pred = tf.round(y_one_prob)
with tf.name_scope("loss"):
# Compute the cross-entropy term for each datapoint
y_expand = tf.expand_dims(y, 1)
entropy = tf.nn.sigmoid_cross_entropy_with_logits(logits=y_logit, labels=y_expand)
# Sum all contributions
l = tf.reduce_sum(entropy)
with tf.name_scope("optim"):
train_op = tf.train.AdamOptimizer(learning_rate).minimize(l)
with tf.name_scope("summaries"):
tf.summary.scalar("loss", l)
merged = tf.summary.merge_all()
Step 6: Add dropout to a hidden layer.
Step 7: Define a hidden layer with dropout.
Step 8: Implement mini-batching training.
train_writer = tf.summary.FileWriter('/tmp/fcnet-tox21',
tf.get_default_graph())
N = train_X.shape[0]
with tf.Session() as sess:
sess.run(tf.global_variables_initializer())
step = 0
for epoch in range(n_epochs):
pos = 0
while pos N:
batch_X = train_X[pos:pos+batch_size]
batch_y = train_y[pos:pos+batch_size]
feed_dict = {x: batch_X, y: batch_y}
_, summary, loss = sess.run([train_op, merged, l], feed_dict=feed_dict)
print("epoch %d, step %d, loss: %f" % (epoch, step, loss))
train_writer.add_summary(summary, step)
step += 1
pos += batch_size
# Make Predictions
valid_y_pred = sess.run(y_pred, feed_dict={x: valid_X})
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Need help filling out the missing sections of this code- the sections.docx
Need help filling out the missing sections of this code. the sections missing are step 6, 7, and 9.
Step 1: Load the Tox21 Dataset.
import numpy as np
np.random.seed(456)
import tensorflow as tf
tf.set_random_seed(456)
import matplotlib.pyplot as plt
import deepchem as dc
from sklearn.metrics import accuracy_score
_, (train, valid, test), _ = dc.molnet.load_tox21()
train_X, train_y, train_w = train.X, train.y, train.w
valid_X, valid_y, valid_w = valid.X, valid.y, valid.w
test_X, test_y, test_w = test.X, test.y, test.w
Step 2: Remove extra datasets.
# Remove extra tasks
train_y = train_y[:, 0]
valid_y = valid_y[:, 0]
test_y = test_y[:, 0]
train_w = train_w[:, 0]
valid_w = valid_w[:, 0]
test_w = test_w[:, 0]
Step 3: Define placeholders that accept minibatches of different sizes.
# Generate tensorflow graph
d = 1024
n_hidden = 50
learning_rate = .001
n_epochs = 10
batch_size = 100
with tf.name_scope("placeholders"):
x = tf.placeholder(tf.float32, (None, d))
y = tf.placeholder(tf.float32, (None,))
Step 4: Implement a hidden layer.
with tf.name_scope("hidden-layer"):
W = tf.Variable(tf.random_normal((d, n_hidden)))
b = tf.Variable(tf.random_normal((n_hidden,)))
x_hidden = tf.nn.relu(tf.matmul(x, W) + b)
Step 5: Complete the fully connected architecture.
with tf.name_scope("output"):
W = tf.Variable(tf.random_normal((n_hidden, 1)))
b = tf.Variable(tf.random_normal((1,)))
y_logit = tf.matmul(x_hidden, W) + b
# the sigmoid gives the class probability of 1
y_one_prob = tf.sigmoid(y_logit)
# Rounding P(y=1) will give the correct prediction.
y_pred = tf.round(y_one_prob)
with tf.name_scope("loss"):
# Compute the cross-entropy term for each datapoint
y_expand = tf.expand_dims(y, 1)
entropy = tf.nn.sigmoid_cross_entropy_with_logits(logits=y_logit, labels=y_expand)
# Sum all contributions
l = tf.reduce_sum(entropy)
with tf.name_scope("optim"):
train_op = tf.train.AdamOptimizer(learning_rate).minimize(l)
with tf.name_scope("summaries"):
tf.summary.scalar("loss", l)
merged = tf.summary.merge_all()
Step 6: Add dropout to a hidden layer.
Step 7: Define a hidden layer with dropout.
Step 8: Implement mini-batching training.
train_writer = tf.summary.FileWriter('/tmp/fcnet-tox21',
tf.get_default_graph())
N = train_X.shape[0]
with tf.Session() as sess:
sess.run(tf.global_variables_initializer())
step = 0
for epoch in range(n_epochs):
pos = 0
while pos N:
batch_X = train_X[pos:pos+batch_size]
batch_y = train_y[pos:pos+batch_size]
feed_dict = {x: batch_X, y: batch_y}
_, summary, loss = sess.run([train_op, merged, l], feed_dict=feed_dict)
print("epoch %d, step %d, loss: %f" % (epoch, step, loss))
train_writer.add_summary(summary, step)
step += 1
pos += batch_size
# Make Predictions
valid_y_pred = sess.run(y_pred, feed_dict={x: valid_X})
Step 9: Use TensorBoard to track model convergence.
include screenshots for the following:
1) a TensorBoard graph for the model, and
2) the loss curve.
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3. C# supports one-dimensional and multi-dimensional arrays. Elements in arrays are accessed using an index. Arrays are zero-indexed and bounds checked to prevent errors. The Length property provides the size of the array.
The ABC of Implementing Supervised Machine Learning with Python.pptx
It is to our fact that machine learning has taken a significant height. However, knowing and understanding how small problems can be solved from a machine learning perspective is necessary to form a good base, appreciate the process of implementation and get started in this domain. Therefore, in this post, I would like to talk about the ABC of implementing Supervised Machine Learning with Python by navigating through a simple example, which is, adding two numbers. So, to put it in simple terms, I would like to make a machine learn to add. This can be put in other words; I would like to develop a predictive model that can add. Sounds simple, right? View the presentation for more details.
Class notes(week 3) on class objects and methods
java notes, object oriented programming using java, java tutorial, lecture notes, java programming notes, java example programs, java programs with explanation, java source code with output, java programs, java coding, java codes, java slides, java notes
Python programming : Threads
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