Lab 2 - Train your model

In this lab we are going the train a PyTorch Model that can classify Simpsons using the resources we have created in the previous lab.
Import dependencies
Start with importing dependencies. If you are using a Notebook in Azure Machine Learning Studio, you have all the latest versions install. If you are running your own Jupyter notebook then you have to install the azureml-sdk (pip install azureml-sdk).
Paste the code below in the first cell and run this cell.
import os
import azureml
import shutil
import urllib.request
import zipfile
​
​
from azureml.core.model import Model, InferenceConfig
from azureml.core import Workspace, Datastore, Experiment, Run
from azureml.core.compute import ComputeTarget, AmlCompute, ComputeTarget
from azureml.train.dnn import PyTorch
from azureml.widgets import RunDetails
from azureml.core.webservice import Webservice, AciWebservice
from azureml.core.environment import Environment
from azureml.core.dataset import Dataset
from azureml.core.resource_configuration import ResourceConfiguration
from azureml.core.conda_dependencies import CondaDependencies 
​
# check core SDK version number
print("Azure ML SDK Version: ", azureml.core.VERSION)
Import dependencies
Connect to your resources
Connect to workspace
Create a new code cell by clicking on the + symbol
Paste the code below
ws = Workspace.from_config()
print("Connected to workspace: AIWorkshop:",ws.name)
Run the cell
Performing the interactive authentication using the link and code provide
Run the cell again
It should say: "Connected to workspace: "
Connect to Azure Machine Learning Compute Cluster
compute_target = ComputeTarget(workspace=ws, name="gpu-cluster")
print("Connected to compute Target:",compute_target.name)
Connect to the default datastore
ds = Datastore.get_default(ws)
print("Connected to datastore:",ds.name)
Connect to resources
Create an experiment
exp = Experiment(workspace=ws, name='Simpsons-PyTorch')
print("Experiment created:",exp.name)
View your created experiment on: https://ml.azure.com​
Data
Download the dataset from Github
data_url = "https://github.com/hnky/dataset-lego-figures/raw/master/_download/train-and-validate.zip"
data_path = "./data"
download_path = os.path.join(data_path,"train-and-validate.zip")
if not os.path.exists(data_path):
    os.mkdir(data_path,);
urllib.request.urlretrieve(data_url, filename=download_path)
Unzip the dataset
zip_ref = zipfile.ZipFile(download_path, 'r')
zip_ref.extractall(data_path)
zip_ref.close()
print("Data extracted in: {}".format(data_path))
​
os.remove(download_path)
print("Downloaded file removed: {}".format(download_path))
View your the downloaded dataset: https://ml.azure.com​
Dataset
Preview the dataset
To take a peak at the images in the dataset paste and the run the code below.
from mpl_toolkits.axes_grid1 import AxesGrid
import random
import cv2
import matplotlib.pyplot as plt
​
path = r"data/train"
random_filenames = []
for tag in os.listdir(path):
    random_filenames.append(path+"/"+tag+"/"+random.choice([
        x for x in os.listdir(os.path.join(path,tag))
        if os.path.isfile(os.path.join(path,tag, x))
    ]))
​
grid = AxesGrid(plt.figure(1, (20,20)), 111, nrows_ncols=(4, 5), axes_pad=0, label_mode="1")
​
i = 0
for img_name in random_filenames[0:10]:
​
    # Download image
    image = cv2.imread(img_name)
    image = cv2.resize(image, (352, 352))
    image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
​
    # Show image in grid
    grid[i].imshow(image)
    i = i+1
Dataset
Upload the data to the datastore
ds.upload(src_dir=data_path, target_path='simpsonslego', overwrite=True, show_progress=True)
Create a dataset from the data in the datastore
datastore_paths = [(ds, 'simpsonslego/**')]
simpsons_ds = Dataset.File.from_files(path=datastore_paths)
Register the dataset
simpsons_ds.register(workspace=ws,
             name='LegoSimpsons',
             description='Simpsons dataset with Lego Figures',
             create_new_version = True)
Load the dataset
simpsons_ds = Dataset.get_by_name(ws, name='LegoSimpsons')
Train the model
Download the training script
project_folder = "./trainingscripts"
​
training_script_url = "https://raw.githubusercontent.com/hnky/DevelopersGuideToAI/master/amls/resources/train.py"
​
training_script_download_path = os.path.join(project_folder,"train.py")
if not os.path.exists(project_folder):
    os.mkdir(project_folder);
urllib.request.urlretrieve(training_script_url, filename=training_script_download_path)
Refresh your files and validate that 'train.py' is downloaded in the folder 'trainingscripts': https://ml.azure.com​
Training Script
Create the PyTorch estimator
script_params = {
    '--data-folder': simpsons_ds.as_named_input('simpsonsdataset').as_mount(),
    '--num-epochs': 15
}
​
estimator = PyTorch(source_directory=project_folder, 
                    script_params=script_params,
                    compute_target=compute_target,
                    entry_script='train.py',
                    use_gpu=True,
                    pip_packages=['azureml-dataprep[fuse,pandas]','pillow==5.4.1'],
                    framework_version='1.3')
Submit the PyTorch estimator
run = exp.submit(estimator)
Follow the progress of the run
RunDetails(run).show()
Click on 'View run details' to view all the details of the run under the experiment.
Training starting
This step can take up to 15 minutes to complete
Training done
Register the model
model = run.register_model(model_name='Simpsons-PyTorch',
                           model_path='outputs',
                           model_framework='PyTorch',
                           model_framework_version='1.3',
                           description="Simpsons PyTorch Classifier (From Jupyter Notebook)",
                           tags={'Conference':'Awesome AI Workshop'},
                           resource_configuration=ResourceConfiguration(cpu=1, memory_in_gb=2))
​
print("Model '{}' version {} registered ".format(model.name,model.version))
Test results
Validate that your model is visible under 'Models': https://ml.azure.com​
Download and test your model
Download the model
model.download(exist_ok=True)
Download test images
test_images_url = "https://github.com/hnky/dataset-lego-figures/raw/master/_download/test-images.zip"
test_images_path = r"./data/test"
test_images_download_path = os.path.join(test_images_path,"test-images.zip")
if not os.path.exists(test_images_path):
    os.mkdir(test_images_path,);
urllib.request.urlretrieve(test_images_url, filename=test_images_download_path)
Unzip test images
zip_ref = zipfile.ZipFile(test_images_download_path, 'r')
zip_ref.extractall(test_images_path)
zip_ref.close()
print("Data extracted in: {}".format(test_images_path))
​
os.remove(download_path)
print("Downloaded file removed: {}".format(test_images_download_path))
Run the model over the test images
import os
import torch
import torch.nn as nn
import torchvision
from torchvision import transforms
import json
import urllib
from PIL import Image
​
# Load the model
loaded_model = torch.load(os.path.join('outputs','model.pth'), map_location=lambda storage, loc: storage)
loaded_model.eval()
​
# Load the labels
with open(os.path.join('outputs','labels.txt'), 'rt') as lf:
    global labels
    labels = [l.strip() for l in lf.readlines()]
​
​
def scoreImage(image_link):
    # Load the image to predict
    input_image = Image.open(image_link)
​
    # Pre process
    preprocess = transforms.Compose([
        transforms.Resize(225),
        transforms.CenterCrop(224),
        transforms.ToTensor(),
        transforms.Normalize(mean=[0.485, 0.456, 0.406], std=[0.229, 0.224, 0.225]),
    ])
    input_tensor = preprocess(input_image)
    input_batch = input_tensor.unsqueeze(0)
​
    # Predict the image
    if torch.cuda.is_available():
        input_batch = input_batch.to('cuda')
        loaded_model.to('cuda')
​
    with torch.no_grad():
        output = loaded_model(input_batch)
​
    index = output.data.cpu().numpy().argmax()
    probability = torch.nn.functional.softmax(output[0], dim=0).data.cpu().numpy().max()
​
    #Return the result
    return {"label": labels[index], "probability": round(probability*100,2)}
​
path = r"data/test"
grid = AxesGrid(plt.figure(1, (20,20)), 111, nrows_ncols=(4, 5), axes_pad=0, label_mode="1")
​
i = 0
for img in os.listdir(path):
​
    #Score the image
    result = scoreImage(os.path.join(path,img))
​
    # Download image
    image = cv2.imread(os.path.join(path,img))
    image = cv2.resize(image, (352, 352))
    image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
​
    cv2.rectangle(image, (0,260),(352,352),(255,255,255), -1)
    cv2.putText(image, "{} - {}%".format(result['label'],result['probability']),(10, 300), cv2.FONT_HERSHEY_SIMPLEX, 0.65,(0,0,0),2,cv2.LINE_AA)    
​
    # Show image in grid
    grid[i].imshow(image)
    i = i+1
Test results
​Continue with lab 3 >​
Azure Machine Learning - Previous
Lab 1 - Environment Setup
Next - Azure Machine Learning
Lab 3 - Deploy your model
Last updated 5 months ago