feat: give feedback about cfg values smaller than 1

Author: wbruna

stable-diffusion.cpp

@@ -1484,6 +1484,23 @@ class StableDiffusionGGML {
         std::vector<int> skip_layers(guidance.slg.layers, guidance.slg.layers + guidance.slg.layer_count);
 
         float cfg_scale     = guidance.txt_cfg;
+        if (cfg_scale <= 1) {
+            if (cfg_scale == 1.f) {
+                LOG_INFO("pure conditioned mode (no negatives)");
+            } else if (cfg_scale == 0.f) {
+                // Diffusers follow the convention from the original paper//
+                // (https://arxiv.org/abs/2207.12598v1), so many distilled model docs recommend
+                // 0 as guidance; warn the user that it disables prompt folowing instead
+                LOG_WARN("unconditioned mode (cfg-scale=0), images won't follow the prompt (use cfg-scale=1 for distilled models)");
+            } else if (cfg_scale < 1) {
+                if (cfg_scale < 0) {
+                    LOG_WARN("negative cfg-scale values aren't supported");
+                } else {
+                    LOG_WARN("cfg-scale values between 0 and 1 aren't supported");
+                }
+            }
+        }
+
         float img_cfg_scale = std::isfinite(guidance.img_cfg) ? guidance.img_cfg : guidance.txt_cfg;
         float slg_scale     = guidance.slg.scale;