This code snippet processes a sequence of data (`scaled_data`) and...

August 30, 2025 at 10:20 AM

for i in range (LOOPBACK, len(scaled_data)): #This code is x_data.append(scaled_data[i - LOOPBACK:i]) y_data.append(scaled_data[i])

This code snippet processes a sequence of data (scaled_data) and organizes it into input-output pairs (x_data and y_data), often used for machine learning purposes, particularly in time series prediction.

Here's a breakdown of what the code does:

  1. Iterates through the data:
    The loop index i begins at LOOPBACK and ends at the length of scaled_data.

  2. Extracts input data (x_data):
    For each iteration, a slice of scaled_data from (i - LOOPBACK) to i is appended to the x_data list. This slice represents a window of size LOOPBACK of sequential past data points leading up to index i.

  3. Extracts output data (y_data):
    For each iteration, the current data point at index i in scaled_data is appended to the y_data list. This represents the target value corresponding to the input window.

Use case:

  • Typically, this structure is used for creating datasets suitable for training supervised machine learning models to predict the next value in a time series.
  • x_data contains sequences of past data with a length determined by LOOPBACK.
  • y_data contains the actual value that follows the respective sequence in x_data.

Example:

If scaled_data = [1, 2, 3, 4, 5, 6] and LOOPBACK = 3, the process works as follows:

  • On the first iteration (i = 3), x_data.append([1, 2, 3]) and y_data.append(4).
  • On the second iteration (i = 4), x_data.append([2, 3, 4]) and y_data.append(5).
  • On the third iteration (i = 5), x_data.append([3, 4, 5]) and y_data.append(6).

After the loop, x_data = [[1, 2, 3], [2, 3, 4], [3, 4, 5]] and y_data = [4, 5, 6].

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