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Logging to tensorboard with manually generated summaries (not relying on summary ops)
"""Simple example on how to log scalars and images to tensorboard without tensor ops.
License: Copyleft
"""
__author__ = "Michael Gygli, Tao He"
import tensorflow as tf
try:
from StringIO import StringIO
except:
from io import StringIO
import matplotlib.pyplot as plt
import numpy as np
class Logger(object):
"""Logging in tensorboard without tensorflow ops."""
def __init__(self, log_dir, *args, **kwargs):
"""Creates a summary writer logging to log_dir."""
self.writer = tf.summary.FileWriter(log_dir, *args, **kwargs)
def log_scalar(self, tag, value, step):
"""Log a scalar variable.
Parameter
----------
tag : basestring
Name of the scalar
value
step : int
training iteration
"""
summary = tf.Summary(value=[tf.Summary.Value(tag=tag,
simple_value=value)])
self.writer.add_summary(summary, step)
def log_images(self, tag, images, step):
"""Logs a list of images."""
im_summaries = []
for nr, img in enumerate(images):
# Write the image to a string
s = StringIO()
plt.imsave(s, img, format='png')
# Create an Image object
img_sum = tf.Summary.Image(encoded_image_string=s.getvalue(),
height=img.shape[0],
width=img.shape[1])
# Create a Summary value
im_summaries.append(tf.Summary.Value(tag='%s/%d' % (tag, nr),
image=img_sum))
# Create and write Summary
summary = tf.Summary(value=im_summaries)
self.writer.add_summary(summary, step)
def log_histogram(self, tag, values, step, bins=1000):
"""Logs the histogram of a list/vector of values."""
# Convert to a numpy array
values = np.array(values)
# Create histogram using numpy
counts, bin_edges = np.histogram(values, bins=bins)
# Fill fields of histogram proto
hist = tf.HistogramProto()
hist.min = float(np.min(values))
hist.max = float(np.max(values))
hist.num = int(np.prod(values.shape))
hist.sum = float(np.sum(values))
hist.sum_squares = float(np.sum(values**2))
# Requires equal number as bins, where the first goes from -DBL_MAX to bin_edges[1]
# See https://github.com/tensorflow/tensorflow/blob/master/tensorflow/core/framework/summary.proto#L30
# Thus, we drop the start of the first bin
bin_edges = bin_edges[1:]
# Add bin edges and counts
for edge in bin_edges:
hist.bucket_limit.append(edge)
for c in counts:
hist.bucket.append(c)
# Create and write Summary
summary = tf.Summary(value=[tf.Summary.Value(tag=tag, histo=hist)])
self.writer.add_summary(summary, step)
def flush(self):
self.writer.flush()
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