Update pipes.py to cast minimum_ld

raiss/pipes.py

@@ -43,5 +43,5 @@ def save_chromosome_imputation(gwas, chrom, window_size, buffer_size,
     # and Saving results
     minimum_ld = 20
     z_fo = "{0}/z_{1}_{2}{3}.txt".format(output_folder, gwas, chrom, tag)
-    filter_output(imputed_zscore, z_fo, float(R2_threshold), minimum_ld=minimum_ld)
+    filter_output(imputed_zscore, z_fo, float(R2_threshold), minimum_ld=float(minimum_ld))
     print("Save imputation done at {0}".format(z_fo))