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Ⅰ Introduction –Republic of Korea •Location East Asia •Capital Seoul •Area 100339 ㎢ ※Tunisia 163610 ㎢ •Population 516 millions Source World Bank Within Asia and Middle East region 18 countries are estimated to face extremely high water stress in

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Organization Regional Office for SouthEast Asia Indraprastha Estate Mahatma Gandhi Marg New Delhi 110 002 India fax 91 11 23370197 email searolibrary The designations employed and the presentation of the material in this publication do not imply the

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using computer vision to evaluate scooter parking | by

With more people integrating electrical scooters into their daily transportation needs, an increasing number of dockless scooters have appeared in all corners of cities around the world. While the flexibility of a dockless micromobility service provides convenience to the user, it is also very important that our scooters are parked in compliance with the city’s transportation regulations, specifically in sidewalk riding and non-compliant parking. Our latest blog post describes how Lime uses machine learning to curb sidewalk riding behavior among users. In this blog, we will explain how Lime applies computer vision to tackle non-compliant scooter parking

Our problem can be framed as follows: given a scooter image, determine whether the scooter is parked correctly and if not return the violation label. The violation label may be whether the scooter is not in the image at all, or whether the scooter is parked too close to the road or blocking the sidewalk

As our problem is inherently one of image classification, convolutional neural networks are a natural choice for this task. All machine learning projects start from a well-labeled training dataset, and this one is no exception. Intuitively, we would like the dataset to contain good quality scooter pictures, in that a human would easily be able to distinguish a correctly parked scooter from an incorrectly parked scooter

using computer vision to evaluate scooter parking | by

The foundation of any successful supervised machine learning project is a high-quality labeled dataset. Otherwise, garbage in, garbage out. Hence, rider parking photos are not well suited for training. We can, however, use them later for testing. Good deployments are stricter than for rider parking. If we can build an accurate classifier for deployments, the same model may be used to solve the problem on the rider side. With this in mind, deployment photos were chosen as the training set for our CNN model

We considered two approaches to building our classification model. In one approach, we could build an end-to-end model in which a single model would take in the input photo, and output a multiclass output vector corresponding to each violation class label. Another modularized approach we could take would be to train a series of binary classifiers, outputting either “parked correctly” or the respective violation label, and subsequently combine the models via a waterfall approach

On the surface, an end-to-end approach is more suitable for this classification task, i.e. training a multiclass classification model. Given a scooter parking photo as an input, the model outputs a vector of length n, which corresponds to the n non-compliant requirements. The value in the ith position of the vector represents the probability of violating requirement i. If the probability is greater than the certain predetermined threshold, the photo is said to violate requirement i. In the end-to-end approach, a photo may potentially have more than one violation

using computer vision to evaluate scooter parking | by

Our experiments showed us that the multiclass classification model in the end-to-end approach required more data to train, took longer to converge, and did not have a satisfactory result. Furthermore, if violation requirements were added or removed from the current set of requirements, the whole model would have to be retrained for this new set of requirements

On the other hand, a modularized approach is more flexible if the parking requirements change more frequently. In this approach, n different binary classification models are trained. A waterfall architecture, ordered by the importance of violations, is illustrated as in the following image. A photo is passed into Model 1, and the model outputs a binary output if the photo is in violation of requirement 1. If it indeed violates requirement 1, the whole prediction process stops and the photo is labeled as violating requirement 1. Otherwise, Model 2 accepts the photo as an input and performs prediction. Continue this procedure as long as the photo does not violate any of the requirements. If all of the n binary classification models do not find this photo in violation, the output will be compliant parking

Easily seen from the architecture, if a new requirement is added, only one binary classifier needs to be trained. And if a requirement is removed, no additional training is needed. With the constantly changing regulatory landscape for the micromobility industry, this modularized, light-weight approach better suits our needs

using computer vision to evaluate scooter parking | by

For the ease of model maintenance, the same model architecture is used for all binary classifiers. Different training sets are fed into this model architecture to train a model for the specific requirements respectively

Several well-known architectures such as AlexNet, VGG-19, and InceptionNet are used in training. However, the performance did not appear to be satisfactory. Then we decided to construct our own customized architecture using several blocks of convolutional layer + max pooling + batch normalization layers as well as fully connected layers with hyperparameters tailored to this specific problem. This model architecture yielded the best results

Amazon SageMaker Notebook and GPU instances are used in the model training. Each model is trained on a dataset of around 54k images for 50 epochs, which takes around 40 minutes. The convergence is fast and steady

using computer vision to evaluate scooter parking | by

One of the biggest critics of the deep learning model is that it is difficult to explain what is really happening under the hood. We made some effort to visualize what the model learns after several convolutional layers

The following example is chosen for the not-too-close-to-road requirement. This requirement states that the scooter shouldn’t be parked so close to the curb of the sidewalk that it may obstruct the vehicles on the road which are also close to the sidewalk

If a person looks at the original picture in the upper left, the most important feature to capture is whether any part of the scooter intersects with the curb line on the sidewalk. In the upper right picture, the highlighted area shows what this deep learning model pays attention to. Noticeably, the curb line and the scooter frame are well captured in those highlighted areas. This sheds some light on why the model for this specific classification task performs well

using computer vision to evaluate scooter parking | by

Recall that we trained one binary classifier for each requirement. Some of the models have over 95% accuracy in a balanced test set. However, some models only have ~85% accuracy. In order to objectively evaluate the model performance, we asked a group of human reviewers to review a sample set of photos from the test sets to approximate Bayes error rate of each classification task. Ten reviewers independently reviewed the same set of sample images, and their average pairwise agreement is taken to be the approximation of Bayes error rate. Our models perform at around the same level as the approximated Bayes error rate

In summary, the performances of these models are high enough to replace the current manual parking photo compliance workflow. The next section will illustrate how Lime leverages this automated compliance technology into the user workflow to enhance the user experience

Having trained our model, With our current computer vision model, every time someone takes a photo of their scooter deployment, we asynchronously call our model to determine compliance of the scooter. If our model determines that the scooter is not in compliance, we send a friendly reminder to the person that their deployment is not in compliance, and encourage them to delpoy correctly next time

using computer vision to evaluate scooter parking | by

However, if the person deploying continually does not park in compliance, we will enforce penalties for the user. We also give them the option to contest our review, to mitigate false positive issues. This flexible approach gives deployment partners the opportunity to override our model, which can then finally be determined by manual review. With the opportunity to contest the model’s review we can also use feedback to continually improve our model performance

To determine the effectiveness of our model and feature, we launched an experiment in Seoul and Busan in Korea. We set up an A/B test, randomized on the deployment partner, in which users in the control group would not receive automated emails to give parking feedback, while users in the test group would receive emails when their deployments had parking violations. We saw that the deployment compliance rate increased by 14% compared to the control group, while there was no deterrent effect on juicer task collection activity. We also removed the need for human labelers to review deployment photos, representing a cost saving for Lime. With this encouraging result, we are planning a global rollout to all markets to ensure better deployment and meet city regulations

Special thanks to Chen Zheng, Adrian Luan, Ben Laufer, Colin McMahon, Michele Weiner, Lei Xu, Aaron Nojima, Charlie McIntyre, Tucker Risman, Jinsong Tan, and many others who made this project possible

using computer vision to evaluate scooter parking | by

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