mudler/LocalAI · warning

Invalid sampler_rng_type: %s, using default\n

Error message

Invalid sampler_rng_type: %s, using default\n

What it means

Warning from the option parser: 'sampler_rng_type=<value>' is not a valid enum name for str_to_rng_type(), so the sampler RNG falls back to the library default. Identical mechanism to the rng_type warning, but for the RNG used during sampling.

Source

Thrown at backend/go/stablediffusion-ggml/cpp/gosd.cpp:550

        if (!strcmp(optname, "flow_shift")) flow_shift = atof(optval);

        if (!strcmp(optname, "rng_type")) {
            rng_type_t parsed = str_to_rng_type(optval);
            if (parsed != RNG_TYPE_COUNT) {
                rng_type = parsed;
                fprintf(stderr, "Found rng_type: %s\n", optval);
            } else {
                fprintf(stderr, "Invalid rng_type: %s, using default\n", optval);
            }
        }
        if (!strcmp(optname, "sampler_rng_type")) {
            rng_type_t parsed = str_to_rng_type(optval);
            if (parsed != RNG_TYPE_COUNT) {
                sampler_rng_type = parsed;
                fprintf(stderr, "Found sampler_rng_type: %s\n", optval);
            } else {
                fprintf(stderr, "Invalid sampler_rng_type: %s, using default\n", optval);
            }
        }
        if (!strcmp(optname, "prediction")) {
            prediction_t parsed = str_to_prediction(optval);
            if (parsed != PREDICTION_COUNT) {
                prediction = parsed;
                fprintf(stderr, "Found prediction: %s\n", optval);
            } else {
                fprintf(stderr, "Invalid prediction: %s, using default\n", optval);
            }
        }
        if (!strcmp(optname, "lora_apply_mode")) {
            lora_apply_mode_t parsed = str_to_lora_apply_mode(optval);
            if (parsed != LORA_APPLY_MODE_COUNT) {
                lora_apply_mode = parsed;
                fprintf(stderr, "Found lora_apply_mode: %s\n", optval);
            } else {
                fprintf(stderr, "Invalid lora_apply_mode: %s, using default\n", optval);

View on GitHub (pinned to 44413a9d06)

Solutions

  1. Correct the value to an exact enum name from the vendored str_to_rng_type
  2. Remove the option to use the default sampler RNG
  3. Look for the 'Found sampler_rng_type:' confirmation line in the log to verify

Example fix

# before
options: "...,sampler_rng_type=philox "  # typo/trailing space

# after
options: "...,sampler_rng_type=philox"
Defensive patterns

Strategy: validation

Validate before calling

// Go caller: same whitelist check for the sampler RNG option
if o, ok := opts.Raw["sampler_rng_type"]; ok && !validRng[o] {
    return fmt.Errorf("invalid sampler_rng_type %q", o)
}

Prevention

When it happens

Trigger: Setting sampler_rng_type to a string not recognized by the vendored stable-diffusion.cpp build (typo, wrong case, or version-mismatched enum name).

Common situations: Config files shared across LocalAI versions whose bundled sd library supports different RNG names; misspellings in gallery model definitions.

Related errors

AI-assisted analysis of mudler/LocalAI@44413a9d06 (2026-08-15). Data as JSON: /api/errors/88fa5364c1fd053c. Report an issue: GitHub.