server: tests: passkey challenge / self-extend with context shift demo (#5832)

* server: tests: add models endpoint scenario

* server: /v1/models add some metadata

* server: tests: add debug field in context before scenario

* server: tests: download model from HF, add batch size

* server: tests: add passkey test

* server: tests: add group attention params

* server: do not truncate prompt tokens if self-extend through group attention is enabled

* server: logs: do not truncate log values

* server: tests - passkey - first good working value of nga

* server: tests: fix server timeout

* server: tests: fix passkey, add doc, fix regex content matching, fix timeout

* server: tests: fix regex content matching

* server: tests: schedule slow tests on master

* server: metrics: fix when no prompt processed

* server: tests: self-extend add llama-2-7B and Mixtral-8x7B-v0.1

* server: tests: increase timeout for completion

* server: tests: keep only the PHI-2 test

* server: tests: passkey add a negative test

1 files changed, 55 insertions, 0 deletions

diff --git a/examples/server/tests/features/passkey.feature b/examples/server/tests/features/passkey.feature
new file mode 100644
index 00000000..1bde7aab
--- /dev/null
+++ b/examples/server/tests/features/passkey.feature
@@ -0,0 +1,55 @@
+# run with: ./tests.sh --no-skipped --tags passkey
+@passkey
+@slow
+Feature: Passkey / Self-extend with context shift
+
+  Background: Server startup
+    Given a server listening on localhost:8080
+
+  # Generates a long text of junk and inserts a secret passkey number inside it.
+  # Then we query the LLM for the secret passkey.
+  # see #3856 and #4810
+  Scenario Outline: Passkey
+    Given a model file <hf_file> from HF repo <hf_repo>
+    And   <n_batch> as batch size
+    And   <n_junk> as number of junk
+    And   <n_predicted> server max tokens to predict
+    And   42 as seed
+    And   <n_ctx> KV cache size
+    And   1 slots
+    And   <n_ga> group attention factor to extend context size through self-extend
+    And   <n_ga_w> group attention width to extend context size through self-extend
+    # Can be override with N_GPU_LAYERS
+    And   <ngl> GPU offloaded layers
+    Then  the server is starting
+    Then  the server is healthy
+    Given available models
+    Then  model 0 is trained on <n_ctx_train> tokens context
+    Given a prefix prompt:
+    """
+    here is an important info hidden inside a lot of irrelevant text. Find it and memorize them. I will quiz you about the important information there.
+    """
+    And a passkey prompt template:
+    """
+    The pass key is <passkey> Remember it. <passkey> is the pass key.
+    """
+    And a junk suffix prompt:
+    """
+    The grass is green. The sky is blue. The sun is yellow. Here we go. There and back again.
+    """
+    And a suffix prompt:
+    """
+    What is the pass key? The pass key is
+    """
+    Given a "<passkey>" passkey challenge prompt with the passkey inserted every <i_pos> junk
+    And  a completion request with no api error
+    Then <n_predicted> tokens are predicted matching <re_content>
+
+    Examples:
+      | hf_repo                         | hf_file                     | n_ctx_train | ngl | n_ctx | n_batch | n_ga | n_ga_w | n_junk | i_pos | passkey | n_predicted | re_content     |
+      | TheBloke/phi-2-GGUF             | phi-2.Q4_K_M.gguf           | 2048        | 5   | 8192  | 512     | 4    | 512    | 250    | 50    | 42      | 1           | 42             |
+      | TheBloke/phi-2-GGUF             | phi-2.Q4_K_M.gguf           | 2048        | 5   | 8192  | 512     | 2    | 512    | 250    | 50    | 42      | 1           | \b((?!42)\w)+\b  |
+      #| TheBloke/Llama-2-7B-GGUF        | llama-2-7b.Q2_K.gguf        | 4096        | 3   | 16384 | 512     | 4    | 512    | 500    | 300   | 1234    | 5           | 1234           |
+      #| TheBloke/Mixtral-8x7B-v0.1-GGUF | mixtral-8x7b-v0.1.Q2_K.gguf | 32768       | 2   | 16384 | 512     | 4    | 512    | 500    | 100   | 0987    | 5           | 0
+      # 987           |
+