Inifinite generation via context swapping (#71)

examples/common.h

@@ -21,6 +21,7 @@ struct gpt_params {
     int32_t n_parts       = -1;   // amount of model parts (-1 = determine from model dimensions)
     int32_t n_ctx         = 512;  // context size
     int32_t n_batch       = 8;    // batch size for prompt processing
+    int32_t n_keep        = 0;    // number of tokens to keep from initial prompt
 
     // sampling parameters
     int32_t top_k = 40;