title: Error feeding a placeholder
body: <p>I´m having issues feeding one of my placeholders (keep_prob). The error says that I have to feed a float value, but I´m already doing it. I´ve been trying to solve it, but I can´t figure out a solution. My code is here:</p>
  
  <p><a href="https://stackoverflow.com/questions/45355116/error-while-running-a-convolutional-network-using-my-own-data-in-tensorflow">Error while running a convolutional network using my own data in Tensorflow</a></p>
  
  <p>And my error is:</p>
  
  <pre><code>File "&lt;ipython-input-81-fd184c90091e&gt;", line 4, in &lt;module&gt;
  keep_prob = tf.placeholder(tf.float32)
  File "c:\python36\lib\site-packages\tensorflow\python\ops\array_ops.py", 
  line 1530, in placeholder
  return gen_array_ops._placeholder(dtype=dtype, shape=shape, name=name)
  File "c:\python36\lib\site-packages\tensorflow\python\ops\gen_array_ops.py", 
  line 1954, in _placeholder
  name=name)
  File "c:\python36\lib\site-
  packages\tensorflow\python\framework\op_def_library.py", line 767, in 
  apply_op
  op_def=op_def)
  File "c:\python36\lib\site-packages\tensorflow\python\framework\ops.py", 
  line 2506, in create_op
  original_op=self._default_original_op, op_def=op_def)
  File "c:\python36\lib\site-packages\tensorflow\python\framework\ops.py", 
  line 1269, in __init__
  self._traceback = _extract_stack()
  
  InvalidArgumentError (see above for traceback): You must feed a value for 
  placeholder tensor 'Placeholder_17' with dtype float
   [[Node: Placeholder_17 = Placeholder[dtype=DT_FLOAT, shape=&lt;unknown&gt;, 
  _device="/job:localhost/replica:0/task:0/cpu:0"]()]]
  </code></pre>
  
  <p>Thank you.</p>