[Feature]: Support multiple input types

🚀 The feature, motivation and pitch

My LLM is trained as follows: First, it obtains the speech_embedding from an external encoder and adaptor. Then, it manually projects prompt_1 into prompt_embedding_1, and prompt_2 into prompt_embedding_2. Finally, it concatenates these three embeddings and feeds them to the LLM: [prompt_embedding_1, speech_embedding, prompt_embedding_2]. Therefore, I wanted the TensorRT-LLM Executor API to support multiple input types, including tokens and embeddings.

Alternatives

I tried using PromptTuningConfig to achieve this, but without success.

const int32_t max_token_id = 151668;

int64_t length = 20;
int64_t hidden_size = 2560;
const __nv_bfloat16 *host_bf16_ptr = reinterpret_cast<const __nv_bfloat16 *>(data_bytes.data());
size_t num_values = length * hidden_size;
size_t num_bytes = num_values * sizeof(__nv_bfloat16);
__nv_bfloat16 *device_bf16_ptr = nullptr;
cudaMalloc(reinterpret_cast<void **>(&device_bf16_ptr), num_bytes);
cudaMemcpy(device_bf16_ptr, host_bf16_ptr, num_bytes, cudaMemcpyHostToDevice);

tle::Shape tensor_shape{length, hidden_size};
tle::Tensor embedding_tensor = tle::Tensor::of(
    tle::DataType::kBF16,
    static_cast<void *>(device_bf16_ptr),
    tensor_shape
);

std::vector<int32_t> prompt_1 = {151644, 8948, 198, 151645, 198, 151644, 872, 14880, 44063, 87752, 43815, 105395, 12857, 104811, 28311};
std::vector<int32_t> prompt_2 = {151645, 198, 151644, 77091, 198, 151667, 271, 151668, 271};

std::vector<int32_t> placeholder_ids(length);
for (size_t i = 0; i < length; ++i) {
    placeholder_ids[i] = max_token_id + i;
}

std::vector<int32_t> input_token_ids;
input_token_ids.insert(input_token_ids.end(), prompt_1.begin(), prompt_1.end());
input_token_ids.insert(input_token_ids.end(), placeholder_ids.begin(), placeholder_ids.end());
input_token_ids.insert(input_token_ids.end(), prompt_2.begin(), prompt_2.end());

auto trtllm_request = tle::Request(input_token_ids, max_new_tokens, request->is_streaming);
tle::PromptTuningConfig ptuning_config(embedding_tensor);
trtllm_request.setPromptTuningConfig(ptuning_config);

auto request_id = trtllm_executor_->enqueueRequest(trtllm_request);

Additional context

I also tried tle::Request::setEmbeddingBias() and tle::Request::setMultimodalEmbedding(), but neither worked.

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