High R2_score in linear regression model

@_umesh wrote:

I’m working on a dataset for load forecasting. I used linear regression for this problem .when I fit my model in my training data, it gave r2 score 1 which is quite high but when I tested this model for the test data I got 0.14 R2 score. what is the possible problem in my , model and what should be done to resolve this problem ?

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