fails on model returning ndarray(s)

Describe the bug

torchinfo.summary() fails on a model that returns numpy ndarray instead of tensors.

To Reproduce

first install https://mmpose.readthedocs.io

from pathlib import Path
import mim
import torchinfo
import torch
from mmpose.apis import init_pose_model

# load model
mmpose_model = 'topdown_heatmap_mspn50_coco_256x192'
models_dir = Path('models')
models_dir.mkdir(exist_ok=True)
mmpose_pth_filename = mim.commands.download('mmpose', [mmpose_model], models_dir)[0]
mmpose_model = init_pose_model(
    str(models_dir / (mmpose_model + '.py')), 
    str(models_dir / mmpose_pth_filename), 
    device='cpu'
)

sample_input_data = dict(
    img=torch.rand(1, 3, 192, 256),
    img_metas=[dict(image_file='xxx', center=(2, 4), scale=(1, 1), rotation=0, bbox_score=0.9,
            flip_pairs=[[1, 2], [3, 4]])],
    return_loss=False,
    return_heatmap=False)
torchinfo.summary(mmpose_model, input_data=sample_input_data, mode='eval')

the code above results in:

AttributeError                            Traceback (most recent call last)
~/anaconda3/envs/mm/lib/python3.7/site-packages/torchinfo/torchinfo.py in forward_pass(model, x, batch_dim, cache_forward_pass, device, mode, **kwargs)
    291             elif isinstance(x, dict):
--> 292                 _ = model.to(device)(**x, **kwargs)
    293             else:

~/anaconda3/envs/mm/lib/python3.7/site-packages/torch/nn/modules/module.py in _call_impl(self, *input, **kwargs)
   1130             for hook in (*_global_forward_hooks.values(), *self._forward_hooks.values()):
-> 1131                 hook_result = hook(self, input, result)
   1132                 if hook_result is not None:

~/anaconda3/envs/mm/lib/python3.7/site-packages/torchinfo/torchinfo.py in hook(module, inputs, outputs)
    540         info.input_size, _ = info.calculate_size(inputs, batch_dim)
--> 541         info.output_size, elem_bytes = info.calculate_size(outputs, batch_dim)
    542         info.output_bytes = elem_bytes * prod(info.output_size)

~/anaconda3/envs/mm/lib/python3.7/site-packages/torchinfo/layer_info.py in calculate_size(inputs, batch_dim)
    129             size = []
--> 130             elem_bytes = list(inputs.values())[0].element_size()
    131             for _, output in inputs.items():

AttributeError: 'numpy.ndarray' object has no attribute 'element_size'

model output:

{'preds': array([[[-24.041672  ,  82.90625   ,   0.50608665],
        [-21.958336  ,  79.78125   ,   0.50380564],
        [-24.041672  ,  79.78125   ,   0.5038374 ],
        [-44.875004  ,  78.21875   ,   0.504611  ],
        [-49.041668  , -78.03125   ,   0.50395286],
        [ 72.83333   , -92.875     ,   0.50649935],
        [-82.375     , -23.34375   ,   0.50320053],
        [-78.208336  , -60.84375   ,   0.50331956],
        [-76.125     , -60.84375   ,   0.50289243],
        [ 78.04166   , -88.96875   ,   0.51409924],
        [-86.541664  , -88.96875   ,   0.51163995],
        [-19.875     ,  95.40625   ,   0.5046092 ],
        [-28.208336  ,  90.71875   ,   0.504157  ],
        [-55.291668  ,  45.40625   ,   0.5035337 ],
        [ 44.70833   ,  45.40625   ,   0.50295764],
        [  3.0416641 , -84.28125   ,   0.5037741 ],
        [  3.0416641 , -84.28125   ,   0.5039975 ]]], dtype=float32), 'boxes': array([[2.e+00, 4.e+00, 1.e+00, 1.e+00, 4.e+04, 9.e-01]], dtype=float32), 'image_paths': ['xxx'], 'bbox_ids': None, 'output_heatmap': None}

torchinfo 1.7.0

TylerYep / torchinfo

fails on model returning ndarray(s) #152