ce/generated/numpy.histogram.html
     * **walltime** (*float*) -- Optional override default
       walltime (time.time()) seconds after epoch of event

  Examples:

     from torch.utils.tensorboard import SummaryWriter
     import numpy as np
     writer = SummaryWriter()
     for i in range(10):
         x = np.random.random(1000)
         writer.add_histogram('distribution centers', x + i, i)
     writer.close()

  Expected result:

  [image]

add_image(tag, img_tensor, global_step=None, walltime=None, dataformats='CHW')
  Add image data to summary.

  Note that this requires the "pillow" package.

  Parameters:
     * **tag** (*str*) -- Data identifier

     * **img_tensor** (*torch.Tensor**, **numpy.ndarray**, or
       **string/blobname*) -- Image data

     * **global_step** (*int*) -- Global step value to record

     * **walltime** (*float*) -- Optional override default
