Do not weight recombination by n in LS HMM

Author: jeromekelleher

Makefile

@@ -7,7 +7,7 @@ CFLAGS=-std=c99 -g -O3 -march=native -funroll-loops -ffast-math \
 all: _tsinfer.cpython-34m.so 
 
 _tsinfer.cpython-34m.so: _tsinfermodule.c 
-	CC="${CC}" CFLAGS="${CFLAGS}" python setup.py build_ext --inplace
+	CC="${CC}" CFLAGS="${CFLAGS}" python3 setup.py build_ext --inplace
 
 ctags:
 	ctags lib/*.c lib/*.h tsinfer/*.py

lib/ancestor_matcher.c

@@ -297,7 +297,8 @@ ancestor_matcher_update_site_likelihood_values(ancestor_matcher_t *self,
     double max_L, p_last, p_no_recomb, p_recomb, p_t, p_e;
     const double rho = self->recombination_rate[site];
     const double mu = self->mismatch_rate[site];
-    const double n = (double) self->tree_sequence_builder->num_match_nodes;
+    /* const double n = (double) self->tree_sequence_builder->num_match_nodes; */
+    const double n = 1;
     const double num_alleles
         = (double) self->tree_sequence_builder->sites.num_alleles[site];