Calculating RSI and other technical indicators

Are there any functions in Kite API to calculate the technical indicators like RSI in the same way as they are shown on the zerodha web/app? I am using RSI function of talib library but the values differ by upto 2-4 points vs that of zerodha (on 5mins candles).
Also, how does Zerodha calculate RSI before 10am, given there aren't 14 candles by then and using previous day's candles should lead to a big jump in RSI (especially in case of gap-up/down opening)?
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