google/gemma-3-1b-it Bringup

models/experimental/gemma3_1b/tests/test_attention.py

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+# SPDX-FileCopyrightText: © 2025 Tenstorrent Inc.
+
+# SPDX-License-Identifier: Apache-2.0
+import os
+
+import pytest
+import torch
+from loguru import logger
+
+import ttnn
+from models.experimental.gemma3_1b.tt.attention import Attention
+from models.tt_transformers.tt.common import PagedAttentionConfig, precompute_freqs
+from models.tt_transformers.tt.rope import RotarySetup
+from models.utility_functions import comp_allclose, comp_pcc, skip_for_grayskull
+
+from models.tt_transformers.tt.model_config import ModelArgs
+
+
+@torch.no_grad()
+@skip_for_grayskull("Requires wormhole_b0 to run")
+@pytest.mark.parametrize(
+    "mesh_device",
+    [
+        {"N150": (1, 1), "N300": (1, 2), "T3K": (1, 8), "TG": (8, 4)}.get(
+            os.environ.get("MESH_DEVICE"), len(ttnn.get_device_ids())
+        )
+    ],
+    indirect=True,
+)
+@pytest.mark.parametrize(
+    "paged_attention",
+    (True,),
+    ids=("paged_attention",),
+)
+@pytest.mark.parametrize(
+    "page_params",
+    [{"page_block_size": 32, "page_max_num_blocks": 1024}],
+)
+@pytest.mark.parametrize(
+    "batch_size",
+    (1,),
+)
+@pytest.mark.parametrize(
+    "max_seq_len",
+    (1,),  # For decode-only unit test, there's no need to run with large sequence lengths
+)
+def test_attention_inference(
+    max_seq_len,
+    batch_size,
+    paged_attention,
+    page_params,
+    mesh_device,
+    reset_seeds,
+):
+    dtype = ttnn.bfloat8_b
+    pcc = 0.99
+
+    model_args = ModelArgs(mesh_device, max_batch_size=batch_size, max_seq_len=128)
+    model_args.n_layers = 1  # For the unit test, just run a single layer
+
+    state_dict = model_args.load_state_dict()
+
+    first_layer_prefix = model_args.get_state_dict_prefix("Attention", 0) + "."
+    # Ref model needs partial state dict, but our models use full state dict keys as cached weight names
+    partial_state_dict = {
+        k[len(first_layer_prefix) :]: v for k, v in state_dict.items() if (k.startswith(first_layer_prefix))
+    }
+
+    reference_model = model_args.reference_attention()
+    reference_model.load_state_dict(partial_state_dict)
+
+    seq_len = 1
+
+    generation_start_pos = 0
+    generation_length = 10
+    all_tests_pass = True
+
+    # Setup RoPE transformation matrices
+    rope_setup = RotarySetup(
+        mesh_device,
+        batch_size,
+        model_args.head_dim,
+        model_args.max_seq_len,
+        model_args.rope_theta,
+        model_args.rope_scaling_factor,
+        model_args.orig_context_len,
+    )
+
+    transformation_mats = rope_setup.get_both_trans_mats()
+
+    page_table_tt = None
+    paged_attention_config = None
+
+    if paged_attention:
+        paged_attention_config = PagedAttentionConfig(
+            block_size=page_params["page_block_size"],
+            max_num_blocks=page_params["page_max_num_blocks"],
+        )
+
+        # Implied shuffling of blocks
+        permutation = torch.randperm(paged_attention_config.max_num_blocks)
+        # Page table which maps virtual blocks to physical
+        reverse_permutation = torch.argsort(permutation)
+        page_table = reverse_permutation.reshape(
+            model_args.max_batch_size, paged_attention_config.max_num_blocks // model_args.max_batch_size
+        )
+        page_table_tt = ttnn.from_torch(
+            page_table,
+            device=mesh_device,
+            dtype=ttnn.int32,
+            layout=ttnn.ROW_MAJOR_LAYOUT,
+            mesh_mapper=ttnn.ShardTensor2dMesh(
+                mesh_device,
+                dims=(None, -2) if (model_args.is_galaxy and batch_size > 1) else (None, None),
+                mesh_shape=model_args.cluster_shape,
+            ),
+        )
+
+    tt_model = Attention(
+        mesh_device,
+        state_dict,
+        weight_cache_path=model_args.weight_cache_path(dtype),
+        layer_num=0,
+        dtype=dtype,
+        transformation_mats=transformation_mats,
+        configuration=model_args,
+        paged_attention_config=paged_attention_config,
+    )
+
+    cos, sin = precompute_freqs(
+        model_args.head_dim,
+        model_args.max_seq_len * 2,
+        model_args.rope_theta,
+        model_args.rope_scaling_factor,
+        model_args.orig_context_len,
+    )
+    freqs_cis = torch.complex(cos, sin)
+
+    # Initial positions
+    current_pos = torch.tensor([generation_start_pos for _ in range(batch_size)])
+    current_pos_tensor = ttnn.from_torch(
+        current_pos,
+        device=mesh_device,
+        dtype=ttnn.int32,
+        mesh_mapper=ttnn.ShardTensor2dMesh(
+            mesh_device,
+            dims=(None, 0) if (model_args.is_galaxy and batch_size > 1) else (None, None),
+            mesh_shape=model_args.cluster_shape,
+        ),
+    )
+
+    for i in range(generation_length):
+        # 70B attention block typically sees tensors with mean 0 and std 0.03 - 0.05 in layer 1
+        pt_attention_input = torch.randn(batch_size, seq_len, model_args.dim)  # Qwen2.5 0.5B sees 0.1 to 2.1
+
+        tt_attention_input = pt_attention_input.clone()
+
+        attention_input = model_args.prepare_residual_tensor_decode(
+            tt_attention_input,
+            model_args.model_config["SHARDED_ATTN_INPUT_MEMCFG"],
+            force_replicated=False if model_args.is_galaxy else True,
+        )
+
+        # Get cos/sin matrices for the current position of each user
+        rot_mats = rope_setup.get_rot_mats(current_pos)
+
+        tt_out = tt_model(
+            attention_input,
+            current_pos_tensor,
+            rot_mats=rot_mats,
+            mode="decode",
+            page_table=page_table_tt,
+        )
+        # multi-device attention module returns replicated output
+        tt_out = ttnn.to_torch(
+            tt_out,
+            mesh_composer=ttnn.ConcatMesh2dToTensor(mesh_device, dims=(1, 3), mesh_shape=model_args.cluster_shape),
+        )
+        tt_output_torch = tt_out[:, 0:1, : model_args.max_batch_size, : model_args.dim].view(-1, 1, model_args.dim)
+
+        # In this test all users have the same position (if using batch > 1)
+        freqs_cis_i = freqs_cis[current_pos[0], :].unsqueeze(0)
+
+        reference_output = reference_model(pt_attention_input, current_pos[0], freqs_cis_i, mask=None)
+
+        passing, pcc_message = comp_pcc(reference_output, tt_output_torch, pcc)
+
+        logger.info(comp_allclose(reference_output, tt_output_torch))
+        logger.info(f"PCC: {pcc_message}")
+        if passing:
+            logger.info(f"[pos={current_pos[0]}] Attention Passed!")
+        else:
+            logger.warning(f"[pos={current_pos[0]}] Attention Failed!")
+            all_tests_pass = False
+
+        # Increment position
+        current_pos = torch.tensor([generation_start_pos + i + 1 for _ in range(batch_size)])
+        current_pos_tensor = ttnn.from_torch(
+            current_pos,
+            device=mesh_device,
+            dtype=ttnn.int32,
+            mesh_mapper=ttnn.ShardTensor2dMesh(
+                mesh_device,
+                dims=(None, 0) if (model_args.is_galaxy and batch_size > 1) else (None, None),
+                mesh_shape=model_args.cluster_shape,
+            ),
+        )
+
+        check_kv_cache = True
+        if check_kv_cache:
+            # PyTorch output --------------------------------------------------------------------
+            pytorch_layer_present = [
+                reference_model.cache_k.clone().permute(0, 2, 1, 3),  # [batch_size, n_kv_heads, seq, head_dim]
+                reference_model.cache_v.clone().permute(0, 2, 1, 3),  # [batch_size, n_kv_heads, seq, head_dim]
+            ]
+            # TT hardware execution -------------------------------------------------------------
+            if paged_attention:
+                tt_layer_present = [
+                    (
+                        ttnn.to_torch(
+                            cache,
+                            mesh_composer=ttnn.ConcatMesh2dToTensor(
+                                mesh_device,
+                                dims=(1, 3) if model_args.is_galaxy else (0, 1),
+                                mesh_shape=model_args.cluster_shape,
+                            ),
+                        )[reverse_permutation][:, : model_args.n_kv_heads, :, : model_args.head_dim]
+                        .reshape(
+                            model_args.max_batch_size,
+                            paged_attention_config.max_num_blocks // model_args.max_batch_size,
+                            model_args.n_kv_heads,
+                            paged_attention_config.block_size,
+                            model_args.head_dim,
+                        )
+                        .transpose(1, 2)
+                        .reshape(model_args.max_batch_size, model_args.n_kv_heads, -1, model_args.head_dim)[
+                            :batch_size, ...
+                        ]
+                    )
+                    for cache in tt_model.layer_past
+                ]
+            else:
+                tt_layer_present = [
+                    ttnn.to_torch(
+                        cache,
+                        mesh_composer=ttnn.ConcatMesh2dToTensor(
+                            mesh_device,
+                            dims=(1, 0) if model_args.is_galaxy else (0, 1),
+                            mesh_shape=model_args.cluster_shape,
+                        ),
+                    )[:batch_size, :, :, :]
+                    for cache in tt_model.layer_past
+                ]
+            for label, cache_pt, cache_tt in zip(["K", "V"], pytorch_layer_present, tt_layer_present):
+                cache_length_to_check = min(model_args.max_seq_len, generation_start_pos + i + 1)
+                cache_pt = cache_pt[:, :, generation_start_pos:cache_length_to_check, :]
+                cache_tt = cache_tt[:, :, generation_start_pos:cache_length_to_check, :]
+                does_pass, output_pcc = comp_pcc(cache_pt, cache_tt, pcc)
+                logger.info(f"{label} cache output: {output_pcc}")
+                if does_pass:
+                    logger.info(f"{label} cache Passed!")
+                else:
+                    logger.warning(f"{label} Cache Failed! PCC value is lower than {pcc}")
+                    all_tests_pass = False
+
+    if all_tests_pass:
+        logger.info("Attention output Passed!")
+    else:
+        logger.warning("Attention output Failed!")
+        assert all_tests_pass, f"PCC value is lower than {pcc} for some of the outputs. Check Warnings!"