Fix importing habana-frameworks library conditionally

tests/test_timing.py

@@ -3,6 +3,7 @@ import pytest
 import scipy.ndimage
 import torch
 
+from whisper.hpu_utils import get_x_hpu
 from whisper.timing import dtw_cpu, dtw_cuda, median_filter, dtw_hpu
 
 sizes = [
@@ -100,7 +101,7 @@ def test_median_filter_equivalence(shape):
 @pytest.mark.parametrize("N, M", sizes)
 def test_dtw_hpu_equivalence(N: int, M: int):
     x_numpy = np.random.randn(N, M).astype(np.float32)
-    x_hpu = torch.from_numpy(x_numpy).to("hpu")
+    x_hpu = get_x_hpu(x_numpy)
 
     trace_cpu = dtw_cpu(x_numpy)
     trace_hpu = dtw_hpu(x_hpu)

whisper/__init__.py

@@ -6,7 +6,6 @@ import warnings
 from typing import List, Optional, Union
 
 import torch
-from habana_frameworks.torch.utils.library_loader import load_habana_module
 from tqdm import tqdm
 
 from .audio import load_audio, log_mel_spectrogram, pad_or_trim
@@ -15,11 +14,6 @@ from .model import ModelDimensions, Whisper
 from .transcribe import transcribe
 from .version import __version__
 
-load_habana_module()  # important to load torch.hpu
-
-if torch.hpu.is_available():
-    from habana_frameworks.torch.hpu import wrap_in_hpu_graph
-
 _MODELS = {
     "tiny.en": "https://openaipublic.azureedge.net/main/whisper/models/d3dd57d32accea0b295c96e26691aa14d8822fac7d9d27d5dc00b4ca2826dd03/tiny.en.pt",
     "tiny": "https://openaipublic.azureedge.net/main/whisper/models/65147644a518d12f04e32d6f3b26facc3f8dd46e5390956a9424a650c0ce22b9/tiny.pt",
@@ -153,6 +147,12 @@ def load_model(
     with (
         io.BytesIO(checkpoint_file) if in_memory else open(checkpoint_file, "rb")
     ) as fp:
+        if device == "hpu":
+            """If the device is HPU,
+            the model should be loaded on CPU first
+            and then moved to HPU."""
+            checkpoint = torch.load(fp, map_location="cpu")
+        else:
             checkpoint = torch.load(fp, map_location=device)
     del checkpoint_file
 
@@ -163,7 +163,12 @@ def load_model(
     if alignment_heads is not None:
         model.set_alignment_heads(alignment_heads)
 
-    if torch.hpu.is_available() or device == "hpu":
+    if device == "hpu":
+        from habana_frameworks.torch.utils.library_loader import load_habana_module
+        from habana_frameworks.torch.hpu import wrap_in_hpu_graph
+
+        load_habana_module()
+        if torch.hpu.is_available():
             return wrap_in_hpu_graph(model)
 
     return model.to(device)

whisper/hpu_utils.py

@@ -1,15 +1,8 @@
-import warnings
-
 import torch
+from habana_frameworks.torch.utils.library_loader import load_habana_module
 
+load_habana_module()
 
-def load_default_hpu() -> str:
+def get_x_hpu(x_numpy):
-    """
+    x_hpu = torch.from_numpy(x_numpy).to("hpu")
-    Load HPU if available, otherwise use CUDA or CPU.
+    return x_hpu
-    """
-
-    if not torch.hpu.is_available():
-        warnings.warn("HPU is not available; trying to use CUDA instead.")
-        return "cuda" if torch.cuda.is_available() else "cpu"
-
-    return "hpu"

whisper/timing.py

@@ -175,8 +175,17 @@ def dtw_hpu(x, BLOCK_SIZE=1024):
 
 
 def dtw(x: torch.Tensor) -> np.ndarray:
+    try:
+        from habana_frameworks.torch.utils.library_loader import load_habana_module
+        load_habana_module()
+
         if torch.hpu.is_available():
             return dtw_hpu(x)
+    except (ImportError, subprocess.CalledProcessError):
+        warnings.warn(
+            "Failed to import Habana modules, likely due to missing Habana libraries; "
+        )
+
     if x.is_cuda:
         try:
             return dtw_cuda(x)

whisper/transcribe.py

@@ -18,7 +18,6 @@ from .audio import (
     pad_or_trim,
 )
 from .decoding import DecodingOptions, DecodingResult
-from .hpu_utils import load_default_hpu
 from .timing import add_word_timestamps
 from .tokenizer import LANGUAGES, TO_LANGUAGE_CODE, get_tokenizer
 from .utils import (
@@ -515,7 +514,11 @@ def cli():
         if device_name == "cuda" and not torch.cuda.is_available():
             warnings.warn("CUDA is not available; using CPU instead")
             device_name = "cpu"
-        if device_name == "hpu" and not torch.hpu.is_available():
+        if device_name == "hpu":
+            from habana_frameworks.torch.utils.library_loader import load_habana_module
+
+            load_habana_module()
+            if not torch.hpu.is_available():
                 warnings.warn("HPU is not available; using CPU instead")
             device_name = "cpu"
 
@@ -526,7 +529,7 @@ def cli():
     parser.add_argument("audio", nargs="+", type=str, help="audio file(s) to transcribe")
     parser.add_argument("--model", default="turbo", type=valid_model_name, help="name of the Whisper model to use")
     parser.add_argument("--model_dir", type=str, default=None, help="the path to save model files; uses ~/.cache/whisper by default")
-    parser.add_argument("--device", default=load_default_hpu(), type=valid_device, help="device to use for PyTorch inference (hpu/cuda/cpu)")
+    parser.add_argument("--device", default="cuda" if torch.cuda.is_available() else "cpu", type=valid_device, help="device to use for PyTorch inference (hpu/cuda/cpu)")
     parser.add_argument("--output_dir", "-o", type=str, default=".", help="directory to save the outputs")
     parser.add_argument("--output_format", "-f", type=str, default="all", choices=["txt", "vtt", "srt", "tsv", "json", "all"], help="format of the output file; if not specified, all available formats will be produced")
     parser.add_argument("--verbose", type=str2bool, default=True, help="whether to print out the progress and debug messages")