Vous créez un modèle d’apprentissage automatique. Comment pouvez-vous vous assurer que c’est le meilleur ?

It is also good to establish constraints such as cost and latency upfront. At scale cost of a solution can be prohibitive, similarly latency of systems such amazon product search is key and understanding these constraints can help with downstream algorithm selection.

building the best machine learning model is an iterative process, and it often involves experimentation and fine-tuning. Regularly reassess your model's performance and be open to making adjustments based on new insights or changes in the data. we can focus on Define Clear Objectives/Data Quality and Preprocessing/Model Selection/Cross-Validation/Iterative Improvement

Choosing the perfect AI model is an excursion. To ensure alignment with our goals and limitations, we need to use a systematic and structured approach. When selecting an AI model, there are certain vital factors to consider. We first need to fully understand the problem we are attempting to solve before defining the goals and outcomes of our model. Subsequently, we must evaluate the resources, time, and expense required for training and the model's factors, such as accuracy, scalability, interpretability, and inference speed. After considering all the positive and negative aspects, we must verify that our model is ethical and reliable to assure fairness, transparency, and long-term sustainability.

To ensure your machine learning model is the best, focus on data quality and diversity, ensuring it's representative of real-world scenarios. Perform thorough feature engineering to extract meaningful attributes. Split your data into training, validation, and test sets to prevent overfitting. Use cross-validation for a more reliable evaluation. Choose the right algorithm for your specific problem and tune hyperparameters meticulously. Monitor performance using appropriate metrics like accuracy, precision, recall, or F1 score, depending on your task. Regularly update your model with new data, and benchmark against existing models. Lastly, consider interpretability and fairness to ensure ethical and understandable model decisions.

Actually, the described way is not the Agile way. And, if you try to follow this path, you will fall into Waterfall SDLC model which was proven over and over to be heavy and very few times successful. Instead, I would suggest: 1. Make the Clarity of Purpose meeting where you explain the basics. 2. Let the Core Team come up with something for what you explained. 3. Analyze the differences in between what you want and what they understood. 4. Define a path correction and create a lesson learnt type of documentation. 5. Perform steps 1 to 4 until there is no path correction (or very small one). Move to step 6. 6. Set a more complex picture and perform steps 1 to 5. Repeat this step until RoI becomes negligible or negative. 7. End project.

Before delving into detailed data analysis, it is imperative to conduct thorough data exploration. This involves identifying discrepancies in the data, such as outliers, missing values, typos, and duplicated entries. Furthermore, the exploration aims to unveil hidden patterns, trends, and correlations among variables. It also includes a comprehensive study of the distribution of data, providing a foundational understanding for subsequent analytical steps.

Optimal algorithm selection is a process of experimentation with the available data. While this involves a hands-on exploration to identify the algorithm that aligns best with the data at hand, the crucial decision of choosing the right class of algorithms depends on the expertise of the data scientist. A deep understanding of the data and the ability to effectively match the algorithm to its inherent patterns and structures play a pivotal role in making informed choices during the model selection process.

A profound comprehension of the dataset facilitates the selection of the most suitable predictive algorithm for your specific use case. In Step-1, one should identify a subset of algorithms tailored to the problem at hand. Subsequently, in Step-2, the model is trained using the chosen algorithms, and their efficiency and accuracy are systematically compared. There is no universal rule for selecting a predictive model; hence, a proficient data scientist often explores multiple algorithms to make informed decisions. The initial step's algorithmic choices are contingent on both the data's characteristics and the inherent nature of the problem under consideration.

After experimenting with data ratios, the next step involves splitting the data into train-test sets. Once the optimal algorithm or class of algorithms is determined, implementation can be done using traditional Python or any other new frameworks. The crucial aspect of this implementation lies in selecting and tuning the right parameters based on the specific scenario. Techniques like GridSearchCV, RandomisedSearchCV, K-fold cross-validation, gradient descent, and advanced boosting algorithms can be employed to fine-tune the base model and enhance overall optimization.

Selecting appropriate validation metrics is crucial for evaluating the effectiveness of your model, and this decision should be aligned with the problem statement and domain. For instance, in a predictive model designed for medical diagnosis, must have very low false-negative rate. In such a context, an acceptable trade-off might involve a lower overall accuracy or true positive rate.

Automated Machine Learning (AutoML) tools can significantly speed up the iteration process by automatically searching through combinations of models and preprocessing steps to find the best solution. These tools can help identify promising approaches that you might not have considered.

Model assessment is a crucial step in the machine learning pipeline, for evaluating the performance and reliability of trained models.After training the model on a dataset, it is essential to assess its effectiveness in making predictions on new, unseen data.This assessment is done by validation and test datasets.The validation dataset is used to fine-tune the model's hyperparameters and ensure it generalizes well to unseen data. Once the model is fine-tuned, the test dataset is then utilized to evaluate its overall performance. It's important that these datasets have the same distribution as the real-world data the model will encounter in production to ensure that the assessment accurately reflects its performance in practical applications

Don’t forget variation! Predictions from many if not all ML methods will vary even when given same inputs. Mathematically, this variation is often represented as “uncertainty”. This is usually mapped as risk to the business. Always compute this and provide it to your customer so that they can account for this in risk management (especially for high-stakes situations).

Understand what you want to achieve and how success will be measured. Quality Data:Ensure your dataset is comprehensive, accurate, and representative of the problem you're addressing. Data Preprocessing:Clean, preprocess, and transform your data to address missing values, outliers, and inconsistencies. Feature Engineering:Choose relevant features or create new ones Select Appropriate Model:Experiment with different algorithms to find the one that performs best Cross-Validation:avoiding overfitting. Regularization:Implement regularization techniques to prevent overfitting and ensure your model generalizes well to new data. Interpretability and Explainability Continuous Monitoring:Regularly monitor the model's performance over time

In my projects, I follow an optimized machine learning model-building process: 1) Introduction 2) Problem statement 3) Importing the required packages & libraries. 4) Data Acquisition 5) Data Pre-profiling 6) Data Pre-processing 7) Data Post-profiling 8) Exploratory Data Analysis 9) Split into Explanatory variables and Target variables 10) Train Test split 11) Splitting into categorical and continuous variables 12) Scaling & Encoding if needed 13) Merge the encoded and scaled data frames 14) Exploratory Data Analysis - 2.0. Assumption check 15) Feature Selection & Dimensionality reduction 16) Machine learning - Implementing Algorithms 17) Model Evaluation - Error checking 18) Hyper parameter tuning and Optimisation 19) Conclusion