sequence_input[:, :,[map_col['holiday'], map_col['weather_main'],map_col['weather_description']]] += 1

This line of code sets the values of certain columns in the sequence_input array to 1. Specifically, it sets the values in the columns corresponding to the 'holiday', 'weather_main', and 'weather_description' features to 1.

The sequence_input array is likely a multi-dimensional array that represents a dataset of some sort. The first dimension likely represents individual data points or observations, while the second dimension represents the features or variables for each observation. The third dimension is not immediately clear from this line of code, but it may represent additional information or metadata associated with each feature.

Setting the values in these columns to 1 could indicate that these features are binary or categorical in nature, where a value of 1 represents the presence of a certain condition or category. For example, the 'holiday' column may have a value of 1 for days that are holidays and 0 for all other days. Similarly, the 'weather_main' and 'weather_description' columns may have different values of 1 for different types of weather conditions.

Overall, without more context about the dataset and the purpose of this code, it is difficult to determine exactly what this line is doing or how it fits into a larger analysis pipeline.