Fix init of batch state (#682)

* fix init of finished buf

* fix `finished_count`

src/turbomind/models/llama/LlamaBatch.cc

@@ -355,7 +355,9 @@ bool LlamaBatch<T>::Initialize()
         });
 
         // all blocks are not enough to hold a single sequence
+        if (!sequences.empty()) {
             FT_CHECK_WITH_INFO(active_end != idxs.begin(), "No enough blocks.");
+        }
 
         // move swap-ins to the back
         auto swapin_beg = std::stable_partition(idxs.begin(), active_end, [&](int idx) {
@@ -398,6 +400,8 @@ bool LlamaBatch<T>::Initialize()
         ClearState(*incoming_);
     }
 
+    FT_CHECK(state_->size <= max_batch_size_);
+
     /// Update block ptrs when there were
     //  1. swap-in or swap-out
     //  2. holes in the active buffer
@@ -810,9 +814,6 @@ auto LlamaBatch<T>::InitializeGeneration() -> GenerationState
     // for
     for (int i = 0; i < batch_size; ++i) {
         h_seq_limit_len_[i] = state_->seq_len_limit[i] + (max_context_len - state_->h_context_length[i]);
-        if (max_context_len >= h_seq_limit_len_[i]) {  // mask finished sequences
-            state_->h_finished[i] = true;
-        }
     }
     Copy(h_seq_limit_len_, batch_size, seq_limit_len_);
     Copy(state_->h_finished, batch_size, finished_buf_);
@@ -1402,6 +1403,8 @@ void LlamaBatch<T>::InternalThreadEntry(int device_id)
         shared_state->barrier->wait();
 
         auto modified = Initialize();
+        // finished sequences is handled by `Initialize()`
+        finished_count = 0;
 
         ContextDecode();