add: day 04 progress

Author: imShakil

README.md

@@ -40,7 +40,7 @@ By the end of the 100 days, you should be able to:
 
 ## Challenge Progress
 
-![3%](https://progress-bar.xyz/3)
+![4%](https://progress-bar.xyz/4)
 
 ## Daily Challenges
 
@@ -49,7 +49,7 @@ By the end of the 100 days, you should be able to:
 | 01 | Create a Python Virtual Environment for ML | Python, virtual environments, project setup | [Solved](days/001.md) |
 | 02 | Set Up and Configure Jupyter Notebook Server | Jupyter, notebooks, local dev setup | [Solved](days/002.md) |
 | 03 | Fix a Broken uv Lockfile Specification | uv, dependency locking, package resolution | [Solved](days/003.md) |
-| 04 | Create a Standard ML Project Structure | repository structure, packaging, conventions | Pending |
+| 04 | Create a Standard ML Project Structure | repository structure, packaging, conventions | [Solved](days/004.md) |
 | 05 | Create a Makefile for ML Workflow Automation | Makefile, task automation, developer workflow | Pending |
 | 06 | Set Up Code Quality Tools for ML Code | linting, formatting, static analysis | Pending |
 | 07 | Package an ML Project as Installable Python Package | packaging, setuptools, installation | Pending |

days/004.md

@@ -0,0 +1,77 @@
+# Create a Standard ML Project Structure
+
+## Problem
+
+A colleague has started a new ML project at `/root/code/fraud-detection/`, but the layout does not match the xFusionCorp Industries standard. Bring the project in line with the team's conventions.
+
+1. Inspect the existing project at `/root/code/fraud-detection/`.
+
+2. The final layout must match the tree below exactly:
+
+    ```files
+    fraud-detection/
+    ├── data/
+    │   ├── raw/
+    │   └── processed/
+    ├── models/
+    ├── notebooks/
+    ├── src/
+    │   ├── data/
+    │   ├── features/
+    │   ├── models/
+    │   └── utils/
+    ├── tests/
+    ├── configs/
+    ├── requirements.txt
+    └── README.md
+    ```
+
+3. Every subdirectory under `src/` must contain an `__init__.py` file so that Python recognises it as a package.
+
+4. `requirements.txt` must list the following dependencies, one per line: `scikit-learn`, `pandas`, `numpy`, and `mlflow`. The canonical PyPI name for the `scikit-learn` package is `scikit-learn`.
+
+5. `README.md` must begin with the heading `# fraud-detection`.
+
+6. Review the existing project and correct everything that does not match the requirements above.
+
+## Solution
+
+1. Updated `Readme.md` according to task 5:
+
+    ```markdown
+    # fraud-detection
+    
+    ```
+
+2. According to required files structures
+
+    - two sub directory `raw` and `processed` is missing under data directory.
+    - `tests` and `configs` directory is also missing
+    - let's create them using the following commands:
+
+    ```bash
+    mkdir -p fraud-detection/data/{raw,processed}
+    mkdir -p fraud-detection/{tests,configs}
+    ```
+
+3. In my case, I found two directories name was wrong (util and feature). Lets rename those directories:
+
+    ```bash
+    mv fraud-detection/src/feature fraud-detection/src/features
+    mv fraud-detection/src/util fraud-detection/src/utils
+    ```
+
+4. For task 3, just inspect and make sure each sub directory has `__init__.py` under `src/` directory. If anyone is missing, then you can create with these commands accordingly.
+
+    ```bash
+    touch fraud-detection/src/data/__init__.py
+    touch fraud-detection/src/features/__init__.py
+    touch fraud-detection/src/models/__init__.py
+    touch fraud-detection/src/utils/__init__.py
+    ```
+
+5. Updated `requirements.txt` file based on the packages that are required to be listed.
+
+    ```bash
+    echo -e "scikit-learn\npandas\nnumpy\nmlflow" > fraud-detection/requirements.txt
+    ```