ValueError could not broadcast input array from shape 224 224 3 into shape 224 224

Question

I have a list say  temp list with following properties      len temp list    9260   temp list 0  shape    224 224 3      Now  when I am converting into numpy array     x   np array temp list      I am getting the error      ValueError  could not broadcast input array from shape  224 224 3  into shape  224 224      Can someone help me here

User · Answer

You can covert numpy ndarray to object using astype object   This will work    gt  gt  gt  a    np zeros  224 224 3   astype object   np zeros  224 224 3   astype object   np zeros  224 224 13   astype object

User · Answer

aravk33  s answer is absolutely correct   I was going through the same problem  I had a data set of 2450 images  I just could not figure out why I was facing this issue   Check the dimensions of all the images in your training data   Add the following snippet while appending your image into your list   if image shape   1 512 512       trainx append image

User · Answer

Yea  Indeed  Evert answer is perfectly correct  In addition I ll like to add one more reason that could encounter such error    gt  gt  gt  np array  np zeros  20 200   np zeros  20 200   np zeros  20 200       This will be perfectly fine  However  This leads to error    gt  gt  gt  np array  np zeros  20 200   np zeros  20 200   np zeros  20 201      ValueError  could not broadcast input array from shape  20 200  into shape  20    The numpy arry within the list  must also be the same size

User · Answer

At least one item in your list is either not three dimensional  or its second or third dimension does not match the other elements  If only the first dimension does not match  the arrays are still matched  but as individual objects  no attempt is made to reconcile them into a new  four dimensional  array  Some examples are below   That is  the offending element s shape        224  3   or ndim    3  with the   being non-negative integer   That is what is giving you the error   You ll need to fix that  to be able to turn your list into a four  or three  dimensional array   Without context  it is impossible to say if you want to lose a dimension from the 3D items or add one to the 2D items  in the first case   or change the second or third dimension  in the second case      Here s an example of the error    gt  gt  gt  a    np zeros  224 224 3    np zeros  224 224 3    np zeros  224 224     gt  gt  gt  np array a  ValueError  could not broadcast input array from shape  224 224 3  into shape  224 224    or  different type of input  but the same error    gt  gt  gt  a    np zeros  224 224 3    np zeros  224 224 3    np zeros  224 224 13     gt  gt  gt  np array a  Traceback  most recent call last     File   lt stdin gt    line 1  in  lt module gt  ValueError  could not broadcast input array from shape  224 224 3  into shape  224 224    Alternatively  similar but with a different error message    gt  gt  gt  a    np zeros  224 224 3    np zeros  224 224 3    np zeros  224 100 3     gt  gt  gt  np array a  Traceback  most recent call last     File   lt stdin gt    line 1  in  lt module gt  ValueError  could not broadcast input array from shape  224 224 3  into shape  224    But the following will work  albeit with different results than  presumably  intended    gt  gt  gt  a    np zeros  224 224 3    np zeros  224 224 3    np zeros  10 224 3     gt  gt  gt  np array a    long output omitted  gt  gt  gt  newa   np array a   gt  gt  gt  newa shape 3    oops  gt  gt  gt  newa dtype dtype  O    gt  gt  gt  newa 0  shape  224  224  3   gt  gt  gt  newa 1  shape  224  224  3   gt  gt  gt  newa 2  shape  10  224  3   gt  gt  gt

User · Answer

This method does not need to modify dtype or ravel your numpy array  The core idea is  1 initialize with one extra row  2 change the list which has one more row  to array 3 delete the extra row in the result array e g   gt  gt  gt  a    np zeros  10 224    np zeros  10      gt  gt  gt  np array a    this will raise error  ValueError  could not broadcast input array from shape  10 224  into shape  10     but below method works  gt  gt  gt  a    np zeros  11 224    np zeros  10      gt  gt  gt  b   np array a   gt  gt  gt  b 0    np delete b 0  0 0   gt  gt  gt  print b shape b 0  shape b 1  shape    print result  2    10 224   10    Indeed  it s not necessarily to add one more row  as long as you can escape from the gap stated in  aravk33 and  user707650  s answer and delete the extra item later  it will be fine

User · Answer

I was facing the same problem because some of the images are grey scale images in my data set  so i solve my problem by doing this     from PIL import Image     img   Image open  my image jpg   convert  RGB         a line from my program     positive images array   np array  np array Image open img  convert  RGB   resize  150  150   Image ANTIALIAS   for img in images in yes directory

[python] ValueError: could not broadcast input array from shape (224,224,3) into shape (224,224)

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