title: Annotations displayed in scientific notation
body: <p>I am converting confusion matrix to heatmap.
  The code to convert the dataframe into heatmap is giving numbers in scientific notation on the graph</p>
  <p>I dont know what to do because when I display the df everything is fine. And I dont know how to tell seaborn to stop doing something like this</p>
  <pre><code>```python
  df_cm = pd.DataFrame(arr, range(2),range(2))
  sns.set(font_scale=1)#for label size
  sns.heatmap(df_cm, annot=True,annot_kws={&quot;size&quot;: 10},)
  ```
  </code></pre>
  <p>The data frame is like this:
  2 rows 2 columns</p>
  <blockquote>
  <p>847 .  22</p>
  <p>114 .  17</p>
  </blockquote>
  <p>But in heat map what comes is</p>
  <blockquote>
  <p>8.5e+2 .  22</p>
  <p>1.1e+2 .  17</p>
  </blockquote>