(on Mac Book M2 Max) Failed to launch ComfyUI with AttributeError: module 'mpmath' has no attribute 'rational'

[taoxu0903]

on Mac book M2 Max, After installing ComfyUI and tried to launch it, met below error:

Total VRAM 32768 MB, total RAM 32768 MB
Forcing FP16.
Set vram state to: SHARED
Device: mps
VAE dtype: torch.float32
Traceback (most recent call last):
File "/Applications/Data/Packages/ComfyUI/main.py", line 76, in
import execution
File "/Applications/Data/Packages/ComfyUI/execution.py", line 11, in
import nodes
File "/Applications/Data/Packages/ComfyUI/nodes.py", line 20, in
import comfy.diffusers_load
File "/Applications/Data/Packages/ComfyUI/comfy/diffusers_load.py", line 3, in
import comfy.sd
File "/Applications/Data/Packages/ComfyUI/comfy/sd.py", line 7, in
from .ldm.cascade.stage_c_coder import StageC_coder
File "/Applications/Data/Packages/ComfyUI/comfy/ldm/cascade/stage_c_coder.py", line 19, in
import torchvision
File "/Applications/Data/Packages/ComfyUI/venv/lib/python3.10/site-packages/torchvision/init.py", line 6, in
from torchvision import _meta_registrations, datasets, io, models, ops, transforms, utils
File "/Applications/Data/Packages/ComfyUI/venv/lib/python3.10/site-packages/torchvision/models/init.py", line 2, in
from .convnext import *
File "/Applications/Data/Packages/ComfyUI/venv/lib/python3.10/site-packages/torchvision/models/convnext.py", line 8, in
from ..ops.misc import Conv2dNormActivation, Permute
File "/Applications/Data/Packages/ComfyUI/venv/lib/python3.10/site-packages/torchvision/ops/init.py", line 23, in
from .poolers import MultiScaleRoIAlign
File "/Applications/Data/Packages/ComfyUI/venv/lib/python3.10/site-packages/torchvision/ops/poolers.py", line 10, in
from .roi_align import roi_align
File "/Applications/Data/Packages/ComfyUI/venv/lib/python3.10/site-packages/torchvision/ops/roi_align.py", line 4, in
import torch._dynamo
File "/Applications/Data/Packages/ComfyUI/venv/lib/python3.10/site-packages/torch/_dynamo/init.py", line 2, in
from . import convert_frame, eval_frame, resume_execution
File "/Applications/Data/Packages/ComfyUI/venv/lib/python3.10/site-packages/torch/_dynamo/convert_frame.py", line 31, in
from torch.fx.experimental.symbolic_shapes import (
File "/Applications/Data/Packages/ComfyUI/venv/lib/python3.10/site-packages/torch/fx/experimental/symbolic_shapes.py", line 63, in
from torch.utils._sympy.functions import FloorDiv, Mod, IsNonOverlappingAndDenseIndicator
File "/Applications/Data/Packages/ComfyUI/venv/lib/python3.10/site-packages/torch/utils/_sympy/functions.py", line 1, in
import sympy
File "/Applications/Data/Packages/ComfyUI/venv/lib/python3.10/site-packages/sympy/init.py", line 30, in
from sympy.core.cache import lazy_function
File "/Applications/Data/Packages/ComfyUI/venv/lib/python3.10/site-packages/sympy/core/init.py", line 9, in
from .expr import Expr, AtomicExpr, UnevaluatedExpr
File "/Applications/Data/Packages/ComfyUI/venv/lib/python3.10/site-packages/sympy/core/expr.py", line 4159, in
from .mul import Mul
File "/Applications/Data/Packages/ComfyUI/venv/lib/python3.10/site-packages/sympy/core/mul.py", line 2193, in
from .numbers import Rational
File "/Applications/Data/Packages/ComfyUI/venv/lib/python3.10/site-packages/sympy/core/numbers.py", line 4567, in
_sympy_converter[type(mpmath.rational.mpq(1, 2))] = sympify_mpmath_mpq
AttributeError: module 'mpmath' has no attribute 'rational'

Process finished with exit code 1

[adityaprakashucd]

Newest release of mpmath seems to be the issue. Downgrading to 1.3.0 fixed it for me.

source /Applications/Data/Packages/ComfyUI/venv/bin/activate
pip install mpmath==1.3.0

[taoxu0903]

thanks and it works well! shall it point to 1.3.0 mpmath on master/main branch until latest mpmatch fixed its bug? today StabilityMatrix can only allow to select master/main when installing ComfyUI, while installing SD webUI both version and branch can be freely selected.