add automatic version support for zero terminal SNR noise schedule op…

…tion from #14145

modules/infotext_versions.py

@@ -4,6 +4,7 @@
 
 
 v160 = version.parse("1.6.0")
+v170_tsnr = version.parse("v1.7.0-225")
 
 
 def parse_version(text):
@@ -33,3 +34,6 @@ def backcompat(d):
     if ver < v160:
         d["Old prompt editing timelines"] = True
 
+    if ver < v170_tsnr:
+        d["Downcast alphas_cumprod"] = True
+