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DeeJanuzandClaude Opus 5.5
1a76d1560b
The history of frame-hands (~/Desktop/Projects/frame-hands on the Frame), filtered to what moves: the camera broker (camd/), the tracker and its offline tools (trackd/), the shared file layouts (include/), the ncnn models, the analysis tools, and the calibration and model helpers they import from the Python prototype. The reverse-engineering notes, probes, camprobe, and the rest of the prototype stay in frame-hands. Unchanged here: the renames to ft- names and Frametop paths follow. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
82 lines
3.3 KiB
Python
82 lines
3.3 KiB
Python
"""Convert the OpenCV Zoo ONNX ports of MediaPipe's hand models to ncnn.
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The ONNX files are Apache-2.0 ports of MediaPipe's palm detector and hand
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landmark models (huggingface.co/opencv/palm_detection_mediapipe and
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huggingface.co/opencv/handpose_estimation_mediapipe). pnnx does the
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conversion; two fix-ups follow:
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- The palm detector widens channels with ONNX Pad on the channel axis. pnnx
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emits an ncnn layer called "Pad", which ncnn doesn't have, so rewrite those
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as ncnn Padding with the channel-end amount (param 8 = behind).
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- Both models take NHWC input and start with a Permute to NCHW. Drop it, so we
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can hand ncnn planar CHW Mats straight from the preprocessing step.
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usage: python convert_models.py (writes models/ncnn/{palm,hand}.ncnn.{param,bin})
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"""
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import os
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import re
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import shutil
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import subprocess
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import sys
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import tempfile
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HERE = os.path.dirname(os.path.abspath(__file__))
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ROOT = os.path.join(HERE, '..')
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PNNX = os.path.join(sys.prefix, 'lib', 'python%d.%d' % sys.version_info[:2], 'site-packages', 'pnnx', 'pnnx')
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MODELS = [('palm', 'palm_detection_mediapipe_2023feb', 192),
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('hand', 'handpose_estimation_mediapipe_2023feb', 224)]
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def patch(param_text, pnnx_param_text):
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lines = param_text.splitlines()
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assert lines[0] == '7767517'
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nlayers, nblobs = map(int, lines[1].split())
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body = lines[2:]
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# Channel pads: amounts come from the pnnx graph, which keeps the pads tuple.
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pads = dict(re.findall(r'^Pad\s+(\S+)\s.*pads=\(0,0,0,0,0,(\d+),0,0\)', pnnx_param_text, re.M))
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for i, line in enumerate(body):
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f = line.split()
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if f[0] == 'Pad':
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amount = pads[f[1]]
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body[i] = 'Padding %s %s %s %s %s 0=0 1=0 2=0 3=0 4=0 5=0.000000e+00 7=0 8=%s' % (
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f[1], f[2], f[3], f[4], f[5], amount)
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# Input permute: feed its consumers from in0 instead.
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perm = next(i for i, line in enumerate(body) if line.split()[0] == 'Permute')
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f = body[perm].split()
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assert f[4] == 'in0' and f[6] == '0=4', body[perm]
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blob = f[5]
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del body[perm]
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for i, line in enumerate(body):
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f = line.split()
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if f[0] == 'Input':
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continue
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nin, nout = int(f[2]), int(f[3])
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ins = ['in0' if b == blob else b for b in f[4:4 + nin]]
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body[i] = ' '.join(f[:4] + ins + f[4 + nin:])
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return '\n'.join(['7767517', '%d %d' % (nlayers - 1, nblobs - 1)] + body) + '\n'
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def main():
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out = os.path.join(ROOT, 'models', 'ncnn')
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os.makedirs(out, exist_ok=True)
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for short, name, size in MODELS:
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src = os.path.join(ROOT, 'models', 'onnx', name + '.onnx')
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with tempfile.TemporaryDirectory() as tmp:
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shutil.copy(src, tmp)
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subprocess.run([PNNX, name + '.onnx', 'inputshape=[1,%d,%d,3]' % (size, size), 'fp16=1'],
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cwd=tmp, check=True, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
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with open(os.path.join(tmp, name + '.ncnn.param')) as f:
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param = f.read()
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with open(os.path.join(tmp, name + '.pnnx.param')) as f:
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pparam = f.read()
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with open(os.path.join(out, short + '.ncnn.param'), 'w') as f:
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f.write(patch(param, pparam))
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shutil.copy(os.path.join(tmp, name + '.ncnn.bin'), os.path.join(out, short + '.ncnn.bin'))
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print('wrote', short)
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if __name__ == '__main__':
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main()
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