[`cuda kernels`] only compile them when initializing (#29133)

* only compile when needed

* fix mra as well

* fix yoso as well

* update

* rempve comment

* Update src/transformers/models/deformable_detr/modeling_deformable_detr.py

* Update src/transformers/models/deformable_detr/modeling_deformable_detr.py

* opps

* Update src/transformers/models/deta/modeling_deta.py

* nit

src/transformers/models/deformable_detr/modeling_deformable_detr.py

@@ -17,8 +17,10 @@
 
 import copy
 import math
+import os
 import warnings
 from dataclasses import dataclass
+from pathlib import Path
 from typing import Dict, List, Optional, Tuple, Union
 
 import torch
@@ -46,21 +48,42 @@ from ...pytorch_utils import meshgrid
 from ...utils import is_accelerate_available, is_ninja_available, logging
 from ...utils.backbone_utils import load_backbone
 from .configuration_deformable_detr import DeformableDetrConfig
-from .load_custom import load_cuda_kernels
 
 
 logger = logging.get_logger(__name__)
 
-# Move this to not compile only when importing, this needs to happen later, like in __init__.
-if is_torch_cuda_available() and is_ninja_available():
-    logger.info("Loading custom CUDA kernels...")
-    try:
-        MultiScaleDeformableAttention = load_cuda_kernels()
-    except Exception as e:
-        logger.warning(f"Could not load the custom kernel for multi-scale deformable attention: {e}")
-        MultiScaleDeformableAttention = None
-else:
-    MultiScaleDeformableAttention = None
+MultiScaleDeformableAttention = None
+
+
+def load_cuda_kernels():
+    from torch.utils.cpp_extension import load
+
+    global MultiScaleDeformableAttention
+
+    root = Path(__file__).resolve().parent.parent.parent / "kernels" / "deta"
+    src_files = [
+        root / filename
+        for filename in [
+            "vision.cpp",
+            os.path.join("cpu", "ms_deform_attn_cpu.cpp"),
+            os.path.join("cuda", "ms_deform_attn_cuda.cu"),
+        ]
+    ]
+
+    MultiScaleDeformableAttention = load(
+        "MultiScaleDeformableAttention",
+        src_files,
+        with_cuda=True,
+        extra_include_paths=[str(root)],
+        extra_cflags=["-DWITH_CUDA=1"],
+        extra_cuda_cflags=[
+            "-DCUDA_HAS_FP16=1",
+            "-D__CUDA_NO_HALF_OPERATORS__",
+            "-D__CUDA_NO_HALF_CONVERSIONS__",
+            "-D__CUDA_NO_HALF2_OPERATORS__",
+        ],
+    )
+
 
 if is_vision_available():
     from transformers.image_transforms import center_to_corners_format
@@ -590,6 +613,14 @@ class DeformableDetrMultiscaleDeformableAttention(nn.Module):
 
     def __init__(self, config: DeformableDetrConfig, num_heads: int, n_points: int):
         super().__init__()
+
+        kernel_loaded = MultiScaleDeformableAttention is not None
+        if is_torch_cuda_available() and is_ninja_available() and not kernel_loaded:
+            try:
+                load_cuda_kernels()
+            except Exception as e:
+                logger.warning(f"Could not load the custom kernel for multi-scale deformable attention: {e}")
+
         if config.d_model % num_heads != 0:
             raise ValueError(
                 f"embed_dim (d_model) must be divisible by num_heads, but got {config.d_model} and {num_heads}"

src/transformers/models/deta/modeling_deta.py

@@ -50,10 +50,15 @@ from .configuration_deta import DetaConfig
 
 logger = logging.get_logger(__name__)
 
+MultiScaleDeformableAttention = None
 
+
+# Copied from models.deformable_detr.load_cuda_kernels
 def load_cuda_kernels():
     from torch.utils.cpp_extension import load
 
+    global MultiScaleDeformableAttention
+
     root = Path(__file__).resolve().parent.parent.parent / "kernels" / "deta"
     src_files = [
         root / filename
@@ -78,22 +83,6 @@ def load_cuda_kernels():
         ],
     )
 
-    import MultiScaleDeformableAttention as MSDA
-
-    return MSDA
-
-
-# Move this to not compile only when importing, this needs to happen later, like in __init__.
-if is_torch_cuda_available() and is_ninja_available():
-    logger.info("Loading custom CUDA kernels...")
-    try:
-        MultiScaleDeformableAttention = load_cuda_kernels()
-    except Exception as e:
-        logger.warning(f"Could not load the custom kernel for multi-scale deformable attention: {e}")
-        MultiScaleDeformableAttention = None
-else:
-    MultiScaleDeformableAttention = None
-
 
 # Copied from transformers.models.deformable_detr.modeling_deformable_detr.MultiScaleDeformableAttentionFunction
 class MultiScaleDeformableAttentionFunction(Function):
@@ -596,6 +585,14 @@ class DetaMultiscaleDeformableAttention(nn.Module):
 
     def __init__(self, config: DetaConfig, num_heads: int, n_points: int):
         super().__init__()
+
+        kernel_loaded = MultiScaleDeformableAttention is not None
+        if is_torch_cuda_available() and is_ninja_available() and not kernel_loaded:
+            try:
+                load_cuda_kernels()
+            except Exception as e:
+                logger.warning(f"Could not load the custom kernel for multi-scale deformable attention: {e}")
+
         if config.d_model % num_heads != 0:
             raise ValueError(
                 f"embed_dim (d_model) must be divisible by num_heads, but got {config.d_model} and {num_heads}"

src/transformers/models/mra/modeling_mra.py

@@ -58,9 +58,11 @@ MRA_PRETRAINED_MODEL_ARCHIVE_LIST = [
     # See all Mra models at https://huggingface.co/models?filter=mra
 ]
 
+mra_cuda_kernel = None
+
 
 def load_cuda_kernels():
-    global cuda_kernel
+    global mra_cuda_kernel
     src_folder = Path(__file__).resolve().parent.parent.parent / "kernels" / "mra"
 
     def append_root(files):
@@ -68,26 +70,7 @@ def load_cuda_kernels():
 
     src_files = append_root(["cuda_kernel.cu", "cuda_launch.cu", "torch_extension.cpp"])
 
-    cuda_kernel = load("cuda_kernel", src_files, verbose=True)
-
-    import cuda_kernel
-
-
-cuda_kernel = None
-
-
-if is_torch_cuda_available() and is_ninja_available():
-    logger.info("Loading custom CUDA kernels...")
-
-    try:
-        load_cuda_kernels()
-    except Exception as e:
-        logger.warning(
-            "Failed to load CUDA kernels. Mra requires custom CUDA kernels. Please verify that compatible versions of"
-            f" PyTorch and CUDA Toolkit are installed: {e}"
-        )
-else:
-    pass
+    mra_cuda_kernel = load("cuda_kernel", src_files, verbose=True)
 
 
 def sparse_max(sparse_qk_prod, indices, query_num_block, key_num_block):
@@ -112,7 +95,7 @@ def sparse_max(sparse_qk_prod, indices, query_num_block, key_num_block):
     indices = indices.int()
     indices = indices.contiguous()
 
-    max_vals, max_vals_scatter = cuda_kernel.index_max(index_vals, indices, query_num_block, key_num_block)
+    max_vals, max_vals_scatter = mra_cuda_kernel.index_max(index_vals, indices, query_num_block, key_num_block)
     max_vals_scatter = max_vals_scatter.transpose(-1, -2)[:, :, None, :]
 
     return max_vals, max_vals_scatter
@@ -178,7 +161,7 @@ def mm_to_sparse(dense_query, dense_key, indices, block_size=32):
     indices = indices.int()
     indices = indices.contiguous()
 
-    return cuda_kernel.mm_to_sparse(dense_query, dense_key, indices.int())
+    return mra_cuda_kernel.mm_to_sparse(dense_query, dense_key, indices.int())
 
 
 def sparse_dense_mm(sparse_query, indices, dense_key, query_num_block, block_size=32):
@@ -216,7 +199,7 @@ def sparse_dense_mm(sparse_query, indices, dense_key, query_num_block, block_siz
     indices = indices.contiguous()
     dense_key = dense_key.contiguous()
 
-    dense_qk_prod = cuda_kernel.sparse_dense_mm(sparse_query, indices, dense_key, query_num_block)
+    dense_qk_prod = mra_cuda_kernel.sparse_dense_mm(sparse_query, indices, dense_key, query_num_block)
     dense_qk_prod = dense_qk_prod.transpose(-1, -2).reshape(batch_size, query_num_block * block_size, dim)
     return dense_qk_prod
 
@@ -393,7 +376,7 @@ def mra2_attention(
     """
     Use Mra to approximate self-attention.
     """
-    if cuda_kernel is None:
+    if mra_cuda_kernel is None:
         return torch.zeros_like(query).requires_grad_()
 
     batch_size, num_head, seq_len, head_dim = query.size()
@@ -561,6 +544,13 @@ class MraSelfAttention(nn.Module):
                 f"heads ({config.num_attention_heads})"
             )
 
+        kernel_loaded = mra_cuda_kernel is not None
+        if is_torch_cuda_available() and is_ninja_available() and not kernel_loaded:
+            try:
+                load_cuda_kernels()
+            except Exception as e:
+                logger.warning(f"Could not load the custom kernel for multi-scale deformable attention: {e}")
+
         self.num_attention_heads = config.num_attention_heads
         self.attention_head_size = int(config.hidden_size / config.num_attention_heads)
         self.all_head_size = self.num_attention_heads * self.attention_head_size

src/transformers/models/yoso/modeling_yoso.py

@@ -35,7 +35,14 @@ from ...modeling_outputs import (
 )
 from ...modeling_utils import PreTrainedModel
 from ...pytorch_utils import apply_chunking_to_forward, find_pruneable_heads_and_indices, prune_linear_layer
-from ...utils import add_code_sample_docstrings, add_start_docstrings, add_start_docstrings_to_model_forward, logging
+from ...utils import (
+    add_code_sample_docstrings,
+    add_start_docstrings,
+    add_start_docstrings_to_model_forward,
+    is_ninja_available,
+    is_torch_cuda_available,
+    logging,
+)
 from .configuration_yoso import YosoConfig
 
 
@@ -49,28 +56,22 @@ YOSO_PRETRAINED_MODEL_ARCHIVE_LIST = [
     # See all YOSO models at https://huggingface.co/models?filter=yoso
 ]
 
+lsh_cumulation = None
+
 
 def load_cuda_kernels():
     global lsh_cumulation
-    try:
-        from torch.utils.cpp_extension import load
+    from torch.utils.cpp_extension import load
 
-        def append_root(files):
-            src_folder = Path(__file__).resolve().parent.parent.parent / "kernels" / "yoso"
-            return [src_folder / file for file in files]
-
-        src_files = append_root(
-            ["fast_lsh_cumulation_torch.cpp", "fast_lsh_cumulation.cu", "fast_lsh_cumulation_cuda.cu"]
-        )
+    def append_root(files):
+        src_folder = Path(__file__).resolve().parent.parent.parent / "kernels" / "yoso"
+        return [src_folder / file for file in files]
 
-        load("fast_lsh_cumulation", src_files, verbose=True)
+    src_files = append_root(["fast_lsh_cumulation_torch.cpp", "fast_lsh_cumulation.cu", "fast_lsh_cumulation_cuda.cu"])
 
-        import fast_lsh_cumulation as lsh_cumulation
+    load("fast_lsh_cumulation", src_files, verbose=True)
 
-        return True
-    except Exception:
-        lsh_cumulation = None
-        return False
+    import fast_lsh_cumulation as lsh_cumulation
 
 
 def to_contiguous(input_tensors):
@@ -305,6 +306,12 @@ class YosoSelfAttention(nn.Module):
                 f"The hidden size ({config.hidden_size}) is not a multiple of the number of attention "
                 f"heads ({config.num_attention_heads})"
             )
+        kernel_loaded = lsh_cumulation is not None
+        if is_torch_cuda_available() and is_ninja_available() and not kernel_loaded:
+            try:
+                load_cuda_kernels()
+            except Exception as e:
+                logger.warning(f"Could not load the custom kernel for multi-scale deformable attention: {e}")
 
         self.num_attention_heads = config.num_attention_heads
         self.attention_head_size = int(config.hidden_size / config.num_attention_heads)