Replaced svg with mermaid diagram.

doc/requirements.txt

 sphinx>2
 sphinx_rtd_theme>=0.3.1
+sphinxcontrib_mermaid>=0.3.1
 numpy
 tensorflow>=1.14
 tensorflow-probability>=0.7.0

doc/source/conf.py

@@ -38,6 +38,7 @@ master_doc = 'index'
 extensions = ['sphinx.ext.autodoc',
               'sphinx.ext.inheritance_diagram',
               'sphinx_rtd_theme',
+              'sphinxcontrib.mermaid'
               ]
 
 # Add any paths that contain templates here, relative to this directory.

doc/source/developer/gemlang.rst

@@ -10,12 +10,21 @@ GEM parsing framework closely follows the source-to-source translation ideas out
 in outlined in :ref:`Figure 1 <parsechain>`.
 
 .. _parsechain:
-.. figure:: parsechain.svg
-    :scale: 60%
-    :alt: GEM parse chain
-
-    Figure 1: The GEM parse chain showing the main stages of the source-to-source translation pipeline.
-
+.. mermaid::
+    :alt: GEM parse chain diagram
+    :align: center
+    :caption: Figure 1: The GEM parse chain showing the main stages of the source-to-source translation pipeline.
+
+    graph LR;
+        gemlang --> lex(Lexical<br />analysis);
+        lex --parse tree--> syntax(Syntactic<br />analysis);
+        syntax --AST--> semantic(Semantic<br />analysis);
+        semantic --AST--> code(Code<br />generator);
+        symboltable[Symbol<br />Table] --> semantic
+        symboltable --> code
+        code --> Python
+        Lark --> lex
+        Lark --> syntax
 
 
 Lexical and Syntactic Analysis