Rearrange the following sentences to form a meaningful passage: 1. Machine learning models require large datasets to train. 2. Data preprocessing ensures that the input is clean and formatted correctly. 3. The model is tested to evaluate its accuracy. 4. Once trained, the model can be deployed for real-world applications.
2-1-3-4
The passage describes the machine learning workflow in chronological order. We need to identify the natural starting point and the logical progression.
Identifying the opener:
Sentence 2 ("Data preprocessing ensures the input is clean") logically comes first because preprocessing is the very first step in any ML pipeline — you must clean the data before doing anything else.
Building the chain:
2 → 1: After preprocessing, you need a large dataset to train the model. This sentence introduces training as the next stage.
1 → 3: After training, the model is tested to evaluate accuracy.
3 → 4: After successful testing, the model can be deployed for real-world applications.
Correct order: 2 – 1 – 3 – 4 (preprocess → train → test → deploy).
Hence the correct option is (A) 2-1-3-4.
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