Darkflow: Training results loss: nan avg loss: nan

[LeeroyHannigan]

Hi all,
Apologies, this is my first time using object detection of any sort, and in fact my first time using python. While trying to train my data set I am getting results as nan.
The error i receive is:
RuntimeWarning: invalid value encountered in sqrt
obj[4] = np.sqrt(obj[4])

Sample annotation xml file

<annotation>
  <folder>images</folder>
  <filename>000006.png</filename>
  <segmented>0</segmented>
  <size>
    <width>225</width>
    <height>225</height>
    <depth>3</depth>
  </size>
  <object>
    <name>person</name>
    <pose>Unspecified</pose>
    <truncated>0</truncated>
    <difficult>0</difficult>
    <bndbox>
      <xmin>35</xmin>
      <ymin>93</ymin>
      <xmax>45</xmax>
      <ymax>45</ymax>
    </bndbox>
  </object>
  <object>
    <name>person</name>
    <pose>Unspecified</pose>
    <truncated>0</truncated>
    <difficult>0</difficult>
    <bndbox>
      <xmin>69</xmin>
      <ymin>94</ymin>
      <xmax>77</xmax>
      <ymax>77</ymax>
    </bndbox>
  </object>
  <object>
    <name>person</name>
    <pose>Unspecified</pose>
    <truncated>0</truncated>
    <difficult>0</difficult>
    <bndbox>
      <xmin>129</xmin>
      <ymin>85</ymin>
      <xmax>136</xmax>
      <ymax>136</ymax>
    </bndbox>
  </object>
  <object>
    <name>person</name>
    <pose>Unspecified</pose>
    <truncated>0</truncated>
    <difficult>0</difficult>
    <bndbox>
      <xmin>145</xmin>
      <ymin>98</ymin>
      <xmax>153</xmax>
      <ymax>153</ymax>
    </bndbox>
  </object>
  <object>
    <name>person</name>
    <pose>Unspecified</pose>
    <truncated>0</truncated>
    <difficult>0</difficult>
    <bndbox>
      <xmin>81</xmin>
      <ymin>143</ymin>
      <xmax>92</xmax>
      <ymax>92</ymax>
    </bndbox>
  </object>
  <object>
    <name>person</name>
    <pose>Unspecified</pose>
    <truncated>0</truncated>
    <difficult>0</difficult>
    <bndbox>
      <xmin>185</xmin>
      <ymin>188</ymin>
      <xmax>195</xmax>
      <ymax>195</ymax>
    </bndbox>
  </object>
  <object>
    <name>person</name>
    <pose>Unspecified</pose>
    <truncated>0</truncated>
    <difficult>0</difficult>
    <bndbox>
      <xmin>77</xmin>
      <ymin>189</ymin>
      <xmax>93</xmax>
      <ymax>93</ymax>
    </bndbox>
  </object>
  <object>
    <name>person</name>
    <pose>Unspecified</pose>
    <truncated>0</truncated>
    <difficult>0</difficult>
    <bndbox>
      <xmin>75</xmin>
      <ymin>204</ymin>
      <xmax>89</xmax>
      <ymax>89</ymax>
    </bndbox>
  </object>
</annotation>

cfg file

[net]
batch=64
subdivisions=8
width=416
height=416
channels=3
momentum=0.9
decay=0.0005
angle=0
saturation = 1.5
exposure = 1.5
hue=.1

learning_rate=0.001
max_batches = 40100
policy=steps
steps=-1,100,20000,30000
scales=.1,10,.1,.1

[convolutional]
batch_normalize=1
filters=16
size=3
stride=1
pad=1
activation=leaky

[maxpool]
size=2
stride=2

[convolutional]
batch_normalize=1
filters=32
size=3
stride=1
pad=1
activation=leaky

[maxpool]
size=2
stride=2

[convolutional]
batch_normalize=1
filters=64
size=3
stride=1
pad=1
activation=leaky

[maxpool]
size=2
stride=2

[convolutional]
batch_normalize=1
filters=128
size=3
stride=1
pad=1
activation=leaky

[maxpool]
size=2
stride=2

[convolutional]
batch_normalize=1
filters=256
size=3
stride=1
pad=1
activation=leaky

[maxpool]
size=2
stride=2

[convolutional]
batch_normalize=1
filters=512
size=3
stride=1
pad=1
activation=leaky

[maxpool]
size=2
stride=1

[convolutional]
batch_normalize=1
filters=1024
size=3
stride=1
pad=1
activation=leaky

###########

[convolutional]
batch_normalize=1
size=3
stride=1
pad=1
filters=1024
activation=leaky

[convolutional]
size=1
stride=1
pad=1
filters=30
activation=linear

[region]
anchors = 1.08,1.19,  3.42,4.41,  6.63,11.38,  9.42,5.11,  16.62,10.52
bias_match=1
classes=1
coords=4
num=5
softmax=1
jitter=.2
rescore=1

object_scale=5
noobject_scale=1
class_scale=1
coord_scale=1

absolute=1
thresh = .5
random=1

I hope someone can point me in the right direction. Its the first time i've tried training my own model.
Thanks,
Lee

[leadcain84]

If the train uses your custom dataset, and it's initial training.
you should be use 'burn_in' because gradient and loss are very unstable in the initial train.
check the code and search 'seen' in https://github.com/marvis/pytorch-yolo2/blob/master/train.py

[Salt-wmx]

i have the same questions... Do you had some idea about this?

[kribby]

This script apparently helps you identify when the Nans start to occur

https://gist.github.com/yuq-1s/ce63a306f1d39d1c0c80d33f7855f3b5

But I am not sure how to use it with darkflow - if you work it out please let me know

[naelabdeljawad]

You are getting nan cuz the Ymin is bigger than Ymax:

<bndbox>
      <xmin>69</xmin>
      <ymin>94</ymin>
      <xmax>77</xmax>
      <ymax>77</ymax>
</bndbox>

Make sure that Min is smaller than Max for both X and Y.