title: How can I display multiple images in one tensorboard tab like it's done in tf-object-detection-api
body: <p>I would like to create tensorboard image summaries using using <code>tf.Summary.Image</code> not using <code>tf.summary.image</code> and tensors. So it should be done without <code>tf.Session</code>. Currently I use this</p>
  
  <pre><code>    with BytesIO() as byte_io:
          img_crop_pil = Image.fromarray(image)
          img_crop_pil.save(byte_io, format="PNG")
          png_buffer = byte_io.getvalue()
      img_summary = tf.Summary.Image(encoded_image_string=png_buffer)
      return tf.Summary.Value(tag='img', image=img_summary)
  </code></pre>
  
  <p>And in tensorboard only one picture displayed. Slider is available but it is not convient especially with multiple steps.
  I would like images to be displayed side by side.</p>