more fixes 20240228 (#1342) [skip ci]

* add missing evals_per_epoch setting

* more pydantic fixes

* more fixes

* move test from normalization to validation

* increase eval size for sample packing tests

tests/e2e/patched/test_lora_llama_multipack.py

@@ -43,7 +43,7 @@ class TestLoraLlama(unittest.TestCase):
                 "lora_alpha": 64,
                 "lora_dropout": 0.05,
                 "lora_target_linear": True,
-                "val_set_size": 0.1,
+                "val_set_size": 0.2,
                 "special_tokens": {
                     "unk_token": "<unk>",
                     "bos_token": "<s>",