Feat(test): Add tests for alpaca chatml prompt tokenizer (#1088)

* draft for adding test for tokenizer

* clean up

* clean up

* fix pre commit

* fix pylint

* Revert "fix pylint"

This reverts commit cd2cda3cda.

* add pylint exception for pytest fixture

* update comments

* Apply suggestions from code review

Co-authored-by: NanoCode012 <kevinvong@rocketmail.com>

* update spelling and import promptstyle

* reaname, restrucure

* clean up

* add fmt:on

---------

Co-authored-by: NanoCode012 <kevinvong@rocketmail.com>

tests/prompt_strategies/test_alpaca.py

@@ -0,0 +1,116 @@
+"""
+Test module for alpaca integration w chatml
+"""
+import pytest
+from datasets import Dataset
+from tokenizers import AddedToken
+from transformers import AutoTokenizer
+
+from axolotl.datasets import TokenizedPromptDataset
+from axolotl.prompt_tokenizers import AlpacaPromptTokenizingStrategy
+from axolotl.prompters import AlpacaPrompter, PromptStyle
+
+
+@pytest.fixture(name="alpaca_dataset")
+def fixture_alpaca_dataset():
+    return Dataset.from_list(
+        [
+            {
+                "instruction": "Evaluate this sentence for spelling and grammar mistakes",
+                "input": "He finnished his meal and left the resturant",
+                "output": "He finished his meal and left the restaurant.",
+            }
+        ]
+    )
+
+
+@pytest.fixture(name="tokenizer")
+def fixture_tokenizer():
+    # pylint: disable=all
+    tokenizer = AutoTokenizer.from_pretrained("mistralai/Mistral-7B-v0.1")
+    tokenizer.add_special_tokens(
+        {
+            "eos_token": AddedToken(
+                "<|im_end|>", rstrip=False, lstrip=False, normalized=False
+            )
+        }
+    )
+    tokenizer.add_tokens(
+        [
+            AddedToken("<|im_start|>", rstrip=False, lstrip=False, normalized=False),
+        ]
+    )
+
+    return tokenizer
+
+
+class TestAlpacaChatml:
+    """
+    Test class for alpaca prompter
+    """
+
+    def test_no_double_im_end(self, alpaca_dataset, tokenizer):
+        strategy = AlpacaPromptTokenizingStrategy(
+            AlpacaPrompter(prompt_style=PromptStyle.CHATML.value),
+            tokenizer,
+            False,  # train_on_inputs
+            2048,  # sequence_len
+        )
+
+        dataset_wrapper = TokenizedPromptDataset(
+            strategy, alpaca_dataset, process_count=1
+        )
+
+        input_ids = dataset_wrapper[0]["input_ids"]
+        # fmt: off
+        assert input_ids == [
+            1,  # Bos
+            32001, 1587, 13, 20548, 336, 349, 396, 13126, 369, 13966, 264, 3638, 28725, 5881, 1360, 395, 396, 2787, 369, 5312, 3629, 2758, 28723, 12018, 264, 2899, 369, 6582, 1999, 2691, 274, 272, 2159, 28723, 32000, 28705, 13,  # instruction
+            32001, 2188, 13, 16627, 11931, 456, 12271, 354, 668, 3572, 304, 18756, 3479, 17179, 13, 2428, 854, 28711, 1497, 516, 11314, 304, 1749, 272, 1846, 324, 440, 32000, 28705, 13,  # input
+            32001, 13892, 13, 650, 5967, 516, 11314, 304, 1749, 272, 9926, 28723, 32000,  # output
+        ]
+        # fmt: on
+
+    def test_no_train_on_input(self, alpaca_dataset, tokenizer):
+        strategy = AlpacaPromptTokenizingStrategy(
+            AlpacaPrompter(prompt_style=PromptStyle.CHATML.value),
+            tokenizer,
+            False,  # train_on_inputs
+            2048,  # sequence_len
+        )
+
+        dataset_wrapper = TokenizedPromptDataset(
+            strategy, alpaca_dataset, process_count=1
+        )
+
+        labels = dataset_wrapper[0]["labels"]
+        # fmt: off
+        assert labels == [
+            -100,  # bos
+            -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100,  # instruction
+            -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100, -100,  # input
+            -100, -100, -100, 650, 5967, 516, 11314, 304, 1749, 272, 9926, 28723, 32000,  # Output
+        ]
+        # fmt: on
+
+    def test_w_train_on_input(self, alpaca_dataset, tokenizer):
+        strategy = AlpacaPromptTokenizingStrategy(
+            AlpacaPrompter(prompt_style=PromptStyle.CHATML.value),
+            tokenizer,
+            True,  # train_on_inputs
+            2048,  # sequence_len
+        )
+
+        dataset_wrapper = TokenizedPromptDataset(
+            strategy, alpaca_dataset, process_count=1
+        )
+
+        labels = dataset_wrapper[0]["labels"]
+        # fmt: off
+        assert labels == [
+            1,  # Bos
+            32001, 1587, 13, 20548, 336, 349, 396, 13126, 369, 13966, 264, 3638, 28725, 5881, 1360, 395, 396, 2787, 369, 5312, 3629, 2758, 28723, 12018, 264, 2899, 369, 6582, 1999, 2691, 274, 272, 2159, 28723, 32000, 28705, 13,  # instruction
+            32001, 2188, 13, 16627, 11931, 456, 12271, 354, 668, 3572, 304, 18756, 3479, 17179, 13, 2428, 854, 28711, 1497, 516, 11314, 304, 1749, 272, 1846, 324, 440, 32000, 28705, 13,  # input
+            32001, 13892, 13, 650, 5967, 516, 11314, 304, 1749, 272, 9926, 28723, 32000,  # output
+        ]
+        # fmt: on