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test-model-random : better default tensor initialization distribution

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This commit is contained in:
Francis Couture-Harpin
2025-06-16 21:30:21 -04:00
parent dfa3c18266
commit 352703b08b
1 changed files with 28 additions and 10 deletions
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38
tests/test-model-random.cpp
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@@ -65,6 +65,7 @@ struct random_tensor {
for (int64_t d : shape) {
prod *= d;
}
GGML_ASSERT(prod != 0);
return ggml_row_size(type, prod);
}
@@ -266,8 +267,20 @@ struct model_variant {
tensors(other.tensors),
metadata(other.metadata) {}
void add_tensor(const std::string & name, const std::vector<int64_t> & shape, float gain = 1.0f) {
// ref: https://github.com/pytorch/pytorch/blob/134179474539648ba7dee1317959529fbd0e7f89/torch/nn/init.py#L515-L516
const auto init_kaiming_uniform = [gain](uint32_t fan_in) {
const float std = gain * std::sqrt(fan_in);
const float bound = std::sqrt(3.0f) * std;
return std::uniform_real_distribution<float>(-bound, bound);
};
tensors.push_back(random_tensor(name, shape, init_kaiming_uniform(shape[0])));
}
void add_tensor(const std::string & name, const std::vector<int64_t> & shape,
const std::function<float(std::mt19937 &)> & distribution = std::normal_distribution<float>()) {
const std::function<float(std::mt19937 &)> & distribution) {
tensors.push_back(random_tensor(name, shape, distribution));
}
@@ -299,7 +312,7 @@ struct model_variant {
size_t total_size = 0;
for (const auto & t : tensors) {
total_size += t.n_bytes() + ggml_tensor_overhead();
total_size += GGML_PAD(t.n_bytes() + ggml_tensor_overhead(), GGML_MEM_ALIGN);
}
ggml_init_params init_params = {
@@ -356,6 +369,11 @@ struct model_variant {
m.add_kv(LLM_KV_TOKENIZER_TOKEN_TYPE, vocab_types);
};
// don't actually use bias
const auto init_bias = []() {
return 0.0f;
};
// TODO: fill the variants
// TODO: how to make the variants more modular?
switch (arch) {
@@ -591,12 +609,12 @@ struct model_variant {
cur.add_tensor(tn(LLM_TENSOR_SSM_IN, "weight", i), { n_embd, 2 * d_inner });
cur.add_tensor(tn(LLM_TENSOR_SSM_CONV1D, "weight", i), { d_conv, d_inner });
cur.add_tensor(tn(LLM_TENSOR_SSM_CONV1D, "bias", i), { d_inner });
cur.add_tensor(tn(LLM_TENSOR_SSM_CONV1D, "bias", i), { d_inner }, init_bias);
cur.add_tensor(tn(LLM_TENSOR_SSM_X, "weight", i), { d_inner, dt_rank + 2 * d_state });
cur.add_tensor(tn(LLM_TENSOR_SSM_DT, "weight", i), { dt_rank, d_inner });
cur.add_tensor(tn(LLM_TENSOR_SSM_DT, "bias", i), { d_inner });
cur.add_tensor(tn(LLM_TENSOR_SSM_DT, "bias", i), { d_inner }, init_bias);
// no "weight" suffix for these
cur.add_tensor(tn(LLM_TENSOR_SSM_A, i), { d_state, d_inner }, init_A_S4D);
@@ -674,19 +692,19 @@ struct model_variant {
// Block 0, LN0
cur.add_tensor(tn(LLM_TENSOR_TOKEN_EMBD_NORM, "weight"), {n_embd});
cur.add_tensor(tn(LLM_TENSOR_TOKEN_EMBD_NORM, "bias"), {n_embd});
cur.add_tensor(tn(LLM_TENSOR_TOKEN_EMBD_NORM, "bias"), {n_embd}, init_bias);
// output
cur.add_tensor(tn(LLM_TENSOR_OUTPUT_NORM, "weight"), {n_embd});
cur.add_tensor(tn(LLM_TENSOR_OUTPUT_NORM, "bias"), {n_embd});
cur.add_tensor(tn(LLM_TENSOR_OUTPUT_NORM, "bias"), {n_embd}, init_bias);
cur.add_tensor(tn(LLM_TENSOR_OUTPUT, "weight"), {n_embd, n_vocab});
for (uint32_t i = 0; i < n_layer; ++i) {
cur.add_tensor(tn(LLM_TENSOR_ATTN_NORM, "weight", i), {n_embd});
cur.add_tensor(tn(LLM_TENSOR_ATTN_NORM, "bias", i), {n_embd});
cur.add_tensor(tn(LLM_TENSOR_ATTN_NORM, "bias", i), {n_embd}, init_bias);
cur.add_tensor(tn(LLM_TENSOR_ATTN_NORM_2, "weight", i), {n_embd});
cur.add_tensor(tn(LLM_TENSOR_ATTN_NORM_2, "bias", i), {n_embd});
cur.add_tensor(tn(LLM_TENSOR_ATTN_NORM_2, "bias", i), {n_embd}, init_bias);
cur.add_tensor(tn(LLM_TENSOR_TIME_MIX_W0, "weight", i), {n_embd});
cur.add_tensor(tn(LLM_TENSOR_TIME_MIX_W1, "weight", i), {n_embd, n_lora_decay});
@@ -721,7 +739,7 @@ struct model_variant {
cur.add_tensor(tn(LLM_TENSOR_TIME_MIX_RECEPTANCE, "weight", i), {attn_hidden_size, n_embd});
cur.add_tensor(tn(LLM_TENSOR_TIME_MIX_LN, "weight", i), {n_embd});
cur.add_tensor(tn(LLM_TENSOR_TIME_MIX_LN, "bias", i), {n_embd});
cur.add_tensor(tn(LLM_TENSOR_TIME_MIX_LN, "bias", i), {n_embd}, init_bias);
cur.add_tensor(tn(LLM_TENSOR_TIME_MIX_OUTPUT, "weight", i), {n_embd, attn_hidden_size});
cur.add_tensor(tn(LLM_TENSOR_CHANNEL_MIX_LERP_K, "weight", i), {n_embd, 1, 1});
@@ -1036,7 +1054,7 @@ int main(int argc, char ** argv) {
for (llama_seq_id seq_id = 0; seq_id < n_seq_max; ++seq_id) {
float err = ref_outputs[seq_id].validate_batch(ctx, batch, seq_id);
if (!isfinite(err) || err > 1.0f / 1024.0f) {
fprintf(stderr, "Error for seq_id %i is %f\n", seq_id, err);
fprintf(stderr, "Error for seq_id %i is %f at n_past=%i\n", seq_id, err, seq_id_n_past[seq_id]);
valid[seq_id] = false;
}
}